EXHIBIT 99.2

                                   ONEOK, INC.

                   2005 SUPPLEMENTAL EXECUTIVE RETIREMENT PLAN


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                                   ONEOK, INC.

                   2005 SUPPLEMENTAL EXECUTIVE RETIREMENT PLAN

                                Table of Contents



                                                                                                                  Page
                                                                                                               
PURPOSE                                                                                                             1
PART A EXCESS RETIREMENT BENEFITS................................................................................   1
   ARTICLE I PURPOSE AND SCOPE OF PART A.........................................................................   1
   ARTICLE II ELIGIBILITY AND PARTICIPATION......................................................................   1
     2.1          ELIGIBILITY FOR SELECTION......................................................................   1
     2.2          SELECTION OF PART A PARTICIPANTS IN THE PLAN...................................................   2
     2.3          SCOPE OF PART A PARTICIPATION..................................................................   2
     2.4          ELECTION TO DEFER COMPENSATION.................................................................   2
   ARTICLE III EXCESS RETIREMENT BENEFIT.........................................................................   3
     3.1          EXCESS RETIREMENT BENEFIT......................................................................   3
     3.2          PAYMENT OF EXCESS RETIREMENT BENEFIT...........................................................   3
     3.3          SUBSEQUENT ELECTIONS; DEFERRED SERP BENEFIT COMMENCEMENT DATE..................................   4
     3.4          VESTING OF EXCESS RETIREMENT BENEFIT...........................................................   5
     3.5          DISABILITY.....................................................................................   5
     3.6          DEATH..........................................................................................   5
     3.7          NONQUALIFIED DEFERRED COMPENSATION PLAN REQUIREMENTS...........................................   5
   ARTICLE IV BENEFICIARY........................................................................................   5
   ARTICLE V LEAVE OF ABSENCE....................................................................................   5
   ARTICLE VI ADMINISTRATION OF PART A OF THE PLAN...............................................................   5
PART B SUPPLEMENTAL RETIREMENT BENEFITS..........................................................................   6
   ARTICLE I PURPOSE AND SCOPE OF PART B.........................................................................   6
   ARTICLE II ELIGIBILITY AND PARTICIPATION......................................................................   6
     2.1          ELIGIBILITY FOR SELECTION......................................................................   6
     2.2          SELECTION OF PART B PARTICIPANTS IN THE PLAN...................................................   6
     2.3          SCOPE OF PART B PARTICIPATION..................................................................   7
     2.4          DOCUMENTS, FORMS, CONFIRMING PARTICIPATION AND BENEFITS........................................   7
     2.5          ELECTION TO DEFER COMPENSATION.................................................................   7
   ARTICLE III SUPPLEMENTAL RETIREMENT BENEFIT...................................................................   7
     3.1          SUPPLEMENTAL RETIREMENT BENEFIT................................................................   7
     3.2          PAYMENT OF SUPPLEMENTAL RETIREMENT BENEFIT.....................................................   9
     3.3          SUBSEQUENT ELECTIONS; DEFERRED SERP BENEFIT COMMENCEMENT DATE..................................  11
     3.4          VESTING OF SUPPLEMENTAL RETIREMENT BENEFIT.....................................................  11


                                     - i -



                                                                                                                
     3.5          FORFEITABILITY OF RETIREMENT BENEFIT...........................................................  11
     3.6          DEATH OF PART B PARTICIPANT....................................................................  12
     3.7          NONQUALIFIED DEFERRED COMPENSATION PLAN REQUIREMENTS. .........................................  12
   ARTICLE IV BENEFICIARY........................................................................................  12
   ARTICLE V SUPPLEMENTAL RETIREMENT BENEFIT ADJUSTMENTS.........................................................  12
   ARTICLE VI LEAVE OF ABSENCE...................................................................................  12
   ARTICLE VII ADMINISTRATION OF PART B OF THE PLAN..............................................................  12
PART C PLAN ADMINISTRATION AND MISCELLANEOUS PROVISIONS..........................................................  13
   ARTICLE I PURPOSE AND SCOPE OF PART C.........................................................................  13
   ARTICLE II DEFINITIONS AND CONSTRUCTION.......................................................................  13
     2.1 DEFINITIONS.............................................................................................  13
     2.2          CONSTRUCTION...................................................................................  18
     2.3          PLAN PURPOSE...................................................................................  18
   ARTICLE III COMMITTEE.........................................................................................  18
     3.1          APPOINTMENT OF COMMITTEE.......................................................................  18
     3.2          COMMITTEE OFFICIALS............................................................................  19
     3.3          COMMITTEE ACTION...............................................................................  19
     3.4          COMMITTEE RULES AND POWERS.....................................................................  19
     3.5          RELIANCE ON CERTIFICATES, ETC..................................................................  19
     3.6          LIABILITY OF COMMITTEE.........................................................................  19
     3.7          DETERMINATION OF BENEFITS......................................................................  20
     3.8          INFORMATION TO COMMITTEE.......................................................................  20
   ARTICLE IV ADOPTION OF PLAN BY SUBSIDIARY, AFFILIATED OR ASSOCIATED COMPANIES.................................  20
   ARTICLE V SOURCE OF BENEFITS..................................................................................  20
     5.1          BENEFITS PAYABLE...............................................................................  20
     5.2          INVESTMENTS TO FACILITATE PAYMENT OF BENEFITS..................................................  20
     5.3          OWNERSHIP OF INSURANCE CONTRACTS...............................................................  21
     5.4          TRUST FOR PAYMENT OF SUPPLEMENTAL RETIREMENT BENEFITS..........................................  21
   ARTICLE VI TERMINATION OF EMPLOYMENT..........................................................................  22
   ARTICLE VII TERMINATION OF PARTICIPATION......................................................................  22
   ARTICLE VIII TERMINATION, AMENDMENT, MODIFICATION, OR SUPPLEMENT OF THE PLAN..................................  22
     8.1          AMENDMENT OR TERMINATION.......................................................................  22
     8.2          RIGHTS AND OBLIGATIONS UPON AMENDMENT, TERMINATION.............................................  23
   ARTICLE IX TREATMENT OF BENEFITS..............................................................................  24
   ARTICLE X RESTRICTIONS ON ALIENATION OF BENEFITS..............................................................  24
   ARTICLE XI MISCELLANEOUS......................................................................................  24


                                     - ii -



                                                                                                    
11.1  Deferral of Compensation Requirements..........................................................  24
11.2  EXECUTION OF RECEIPTS AND RELEASES.............................................................  25
11.3  NO GUARANTEE OF INTERESTS......................................................................  25
11.4  COMPANY RECORDS................................................................................  25
11.5  EVIDENCE.......................................................................................  26
11.6  NOTICE.........................................................................................  26
11.7  CHANGE OF ADDRESS..............................................................................  26
11.8  EFFECT OF PROVISIONS...........................................................................  26
11.9  HEADINGS.......................................................................................  26
11.10 GOVERNING LAW..................................................................................  26
11.11 EFFECTIVE DATE.................................................................................  27


                                    - iii -


                                   ONEOK, INC.
                   2005 SUPPLEMENTAL EXECUTIVE RETIREMENT PLAN

                                     PURPOSE

      The purpose of the ONEOK, Inc. 2005 Supplemental Executive Retirement Plan
is to provide the specified benefits to employees who are in a select group of
management or highly compensated employees who contribute materially to the
continued growth, development and future business success of ONEOK, Inc., and
its subsidiaries, effective January 1, 2005. It is the intention of ONEOK, Inc.
that the Plan and the particular benefits provided to individuals hereunder be
administered as an unfunded deferred compensation and excess benefit plans
established and maintained for a select group of management or highly
compensated employees.

      This Plan is a new and separate plan, and except as otherwise expressly
provided herein, is not a continuation, successor plan to, or an amendment or
restatement of the preexisting and separate ONEOK, Inc. Supplemental Executive
Retirement Plan, as terminated and frozen pursuant to the terms thereof,
effective December 31, 2004 (hereinafter referred to as the "Prior Frozen
SERP"). It is intended that no individual shall be entitled to benefit under the
both the Prior Frozen SERP and this Plan.

      The Plan is intended to meet all requirements of Section 409A of the Code
for compensation deferred under the Plan to not be includible in gross income of
the Participant until actually paid or distributed pursuant to the Plan.

                       PART A EXCESS RETIREMENT BENEFITS

                                    ARTICLE I
                           PURPOSE AND SCOPE OF PART A

      The provisions of Part A of the Plan shall establish and provide excess
retirement benefits to Employees of the Company who are (i) in a select group of
management or highly compensated employees of the Company within the meaning of
Sections 201(a)(7), 301(a)(9) and 401(a)(1) of ERISA, and (ii) selected to
participate in Excess Retirement Benefits pursuant to the terms and provisions
of this Part A of the Plan. The Excess Retirement Benefits provided to
participants under Part A of the Plan are separate and independent from
Supplemental Retirement Benefits provided under Part B of the Plan.

                                   ARTICLE II
                          ELIGIBILITY AND PARTICIPATION

2.1   ELIGIBILITY FOR SELECTION.

      In order to be eligible to be selected as a Part A Participant in the Plan
      pursuant to Section 2.2 of this Article II, below, an Employee must be in
      a select group of management or highly compensated employees of the
      Company, as determined by the Chief Executive Officer, or the Committee in
      the case of the Chief Executive Officer, in the Chief Executive Officer's
      (or Committee's, as applicable)sole and absolute discretion.



      An eligible Employee may become a Part A Participant in the Plan only by
      being selected for participation pursuant to Section 2.2 of this Article
      II, below.

2.2   SELECTION OF PART A PARTICIPANTS IN THE PLAN. In order to participate in
      Part A of the Plan an eligible Employee must also be specifically selected
      by the Chief Executive Officer, or in the case of the Chief Executive
      Officer, by the Committee, to be a Part A Participant in the Plan, with
      such selection to be in the Chief Executive Officer's (or Committee's, as
      applicable) sole and absolute discretion. It is not intended by the Plan
      that every eligible Employee is required to be, or necessarily will be
      selected to be a Part A Participant in the Plan, and an eligible Employee
      who is not selected to be a Part A Participant pursuant to this Section
      2.2, shall not be entitled to any benefit or payment under Part A of the
      Plan. The selection of any eligible Employee to be a Part A Participant in
      the Plan by the Chief Executive Officer/Committee, shall be confirmed in
      writing by a written instrument and/or memorandum in such form as is
      prescribed by the Committee which shall be maintained in the records of
      the Company.

      Provided, that no Employee who is a participant in the Prior Frozen SERP
      or entitled to receive any benefit or payment under the Prior Frozen SERP
      shall be selected to be a Part A Participant in the Plan; and it may be
      made a condition to the selection of an eligible Employee as a Part A
      Participant that such Employee shall have elected in writing to completely
      terminate his/her participation in the Prior Frozen SERP and waive all
      his/her entitlement to any benefit or payment under the Prior Frozen SERP;
      and notwithstanding anything otherwise provided herein, any eligible
      Employee who becomes a Part A Participant shall be deemed to consent and
      agree that his/her participation in Part A of the Plan shall supersede and
      cancel any entitlement he/she had to any benefit or payment under the
      Prior Frozen SERP.

2.3   SCOPE OF PART A PARTICIPATION. An Employee who is eligible and is selected
      to be a Part A Participant in the Plan shall, as a Part A Participant, be
      entitled solely to the rights and benefits provided under the terms of
      Part A of the Plan, and such eligibility and selection shall not entitle
      such Employee to participate in Part B of the Plan or to receive benefits
      thereunder; provided, that an Employee who is an Officer of the Company
      may be selected to be a Part A Participant and a Part B Participant under
      the Plan.

2.4   ELECTION TO DEFER COMPENSATION. Each Employee/Officer who becomes a Part A
      Participant in the Plan shall be required to sign and deliver to the
      Committee, or its designee, a written Election related to the payment of
      his/her Excess Retirement Benefit at the time or times specified by the
      Plan, including any voluntary or deemed Subsequent Elections that occur
      pursuant to the Plan subsequent to his/her Initial Participation Date. The
      written Election of a Part A Participant shall be made on or before the
      expiration of thirty (30) days after the Initial Participation Date of
      such Part A Participant, and if or to the extent any Part A Participant
      shall fail to sign and deliver such a written Election within that time
      and in the manner prescribed by the Committee he/she shall nevertheless be
      considered for all purposes, by reason of his/her participation in the
      Plan, to have made an Election at his/her Initial Participation Date to
      defer Compensation in the manner provided for in the Plan, and to have
      elected, agreed and consented to, and to make any elections, whether upon
      his/her Initial Participation Date or thereafter in

                                     - 2 -


      accordance with and subject to the terms and provisions of the Plan,
      including without limitation, any Subsequent Elections as provided for
      pursuant to Article III of this Part A, below.

                                   ARTICLE III
                            EXCESS RETIREMENT BENEFIT

3.1   EXCESS RETIREMENT BENEFIT. The Company shall pay to each Part A
      Participant the vested Excess Retirement Benefit attributable to a Part A
      Participant's annual eligible compensation under the Retirement Plan that
      is in excess of the limitations on such Part A Participant's Retirement
      Plan benefits contained in Code Sections 401(a)(17) and 415(b). The Excess
      Retirement Benefit will be computed by applying the same benefit formula,
      vesting provisions, and early retirement provisions as are in and apply to
      the Part A Participant's Retirement Plan Benefit under the Retirement
      Plan.

3.2   PAYMENT OF EXCESS RETIREMENT BENEFIT. A. A. Subject to paragraphs B, C, D
      and E of this Section 3.2, below, the Excess Retirement Benefit shall be
      paid to the Part A Participant entitled thereto or his/her Beneficiary,
      commencing on his/her Normal SERP Benefit Commencement Date, and
      thereafter at the same time and in the same form of benefit, and
      actuarially adjusted to the same extent, as the corresponding Retirement
      Plan Benefit of such Part A Participant (or Beneficiary, if applicable) is
      paid under the Retirement Plan.

            B. Provided, that except in the case of and to the extent of a Key
      Employee Required Deferral, a Part A Participant shall be entitled to make
      a Subsequent Election to change the date of distribution and payment of
      his/her Excess Retirement Benefit from his/her Normal SERP Benefit
      Commencement Date to the Deferred SERP Benefit Commencement Date resulting
      from such election, if:

      (i) he/she does not commence receiving payment of his/her Retirement Plan
      Benefit on or before his/her Normal SERP Benefit Commencement Date,

      (ii) he/she makes a corresponding Subsequent Election with respect to the
      Supplemental Retirement Benefit, if any, he/she is entitled to under Part
      B of the Plan, and

      (iii) he/she delivers a written notification of such Subsequent Election
      to the Committee, or its designee, in the form it prescribes, not less
      than twelve (12) months prior to his/her Normal SERP Benefit Commencement
      Date.

      The Committee, in its discretion, may allow a Part A Participant to make a
      Subsequent Election as to any Deferred SERP Benefit Commencement Date
      established for the payment of his/her Excess Retirement Benefit under and
      subject to the same conditions and requirements as set forth above in this
      paragraph 3.2.B.

      Provided, that notwithstanding the foregoing, a Subsequent Election
      deferral will always occur pursuant to a Part A Participant's initial
      Election in any case in which he/she does not commence receiving his/her
      Retirement Plan Benefit on his/her Normal SERP Benefit Commencement Date,
      or on or before a Deferred SERP Benefit Commencement

                                     - 3 -


      Date, in accordance with paragraph D of this Section 3.2, below,
      notwithstanding that no other written notification is delivered by him/her
      pursuant to the foregoing provisions.

            C. Notwithstanding anything otherwise provided in the Plan or in any
      Election or Subsequent Election of a Part A Participant, any Subsequent
      Election made under the Plan shall result in the first payment with
      respect to which such Subsequent Election is made being deferred for a
      period of five (5) years from the date such payment would otherwise have
      been made; the payment and distribution of any Excess Retirement Benefit
      and any Supplemental Retirement Benefit to which a Part A Participant is
      entitled under the Plan shall in all cases be made simultaneously; and the
      payment and distribution of such Excess Retirement Benefit and
      Supplemental Retirement Benefit shall in no case commence or be made prior
      to the commencement of payment of such Part A Participant's Retirement
      Plan Benefit.

            D. Provided, further, that if the payment of the Retirement Plan
      Benefit to which a Part A Participant is entitled for any reason does not
      commence on or before his/her Normal SERP Benefit Commencement Date, or a
      then existing Deferred SERP Benefit Commencement Date established for such
      Part A Participant under the Plan, then in such event, subject to
      compliance with all nonqualified deferred compensation plan requirements
      governing the Plan under Section 3.7, below, such Part A Participant's
      initial Election shall be followed and shall be deemed for all purposes to
      be a Subsequent Election and to change the date of distribution and
      payment of his/her Excess Retirement Benefit to a subsequent Deferred SERP
      Benefit Commencement Date resulting from such Subsequent Election.

            E. If a Part A Participant does not commence receiving his
      Retirement Plan Benefit on his Normal SERP Benefit Commencement Date, and
      a Deferred SERP Benefit Commencement Date is established for the payment
      of his/her Excess Retirement Benefit, then upon commencement of payment of
      his/her Excess Retirement Benefit on a Deferred SERP Benefit Commencement
      Date such Part A Participant shall be entitled to receive an Excess
      Retirement Benefit Catch-Up Payment on that Deferred SERP Benefit
      Commencement Date, if and to the extent the payment of his/her Retirement
      Plan Benefit has commenced prior to such Deferred SERP Benefit
      Commencement Date.

            F. If a Part A Participant is a Key Employee his/her Excess
      Retirement Benefit shall not commence being paid until after the end of
      the Key Employee Required Deferral Period. In such a case the Part A
      Participant shall receive a Key Employee Catch-Up Payment at the end of
      the Key Employee Required Deferral Period and thereafter receive Excess
      Retirement Benefit monthly payments in accordance with the Plan.

3.3   SUBSEQUENT ELECTIONS; DEFERRED SERP BENEFIT COMMENCEMENT DATE.
      Notwithstanding anything to the contrary provided herein, if a Part A
      Participant makes a Subsequent Election or is deemed to have made a
      Subsequent Election to change the time of distribution or payment of such
      Part A Participant's Excess Retirement Benefit the Subsequent Election
      shall result in a Deferred SERP Benefit Commencement Date being
      established for such Part A Participant based upon the time of such
      Subsequent Election.

                                     - 4 -


      A Part A Participant's initial Election shall include his/her consent and
      agreement, to all terms and provisions of the Plan with respect to any
      Subsequent Election and the effect thereof with respect to the time and
      form of payment of any Excess Retirement Benefit he/she is entitled to
      receive under the Plan.

3.4   VESTING OF EXCESS RETIREMENT BENEFIT. A Part A Participant's Excess
      Retirement Benefit shall unconditionally vest in such Participant and
      become nonforfeitable upon such Part A Participant's completion of five
      (5) Years of Service; provided, that the Excess Retirement Benefit shall
      not be vested and nonforfeitable upon Retirement if the Group A
      Participant has not completed five (5) Years of Service.

3.5   DISABILITY. If a Part A Participant shall become Totally and Permanently
      Disabled prior to Retirement and such total disability continues for more
      than six (6) months, such Participant shall be entitled to receive an
      Excess Retirement Benefit in the form and at the time he/she is entitled
      to his/her Retirement Plan Benefit.

3.6   DEATH. In event of the death of a Part A Participant prior to his/her
      Retirement, the Excess Retirement Benefit of such Part A Participant shall
      be paid in the form and at the time his/her Retirement Plan Benefit is
      paid to his/her Beneficiary after his/her death.

3.7   NONQUALIFIED DEFERRED COMPENSATION PLAN REQUIREMENTS. Notwithstanding
      anything to the contrary expressed or implied herein, the deferral of all
      Compensation under this Plan shall be subject to the requirements set
      forth in Article XI, Section 11.1 of Part C of the Plan.

                                   ARTICLE IV
                                   BENEFICIARY

      The Beneficiary of a Part A Participant's Excess Retirement Benefit shall
be the beneficiary of such Part A Participant's corresponding Retirement Plan
Benefit.

                                   ARTICLE V
                                LEAVE OF ABSENCE

      If a Part A Participant is authorized by the Company for any reason,
including military, medical, or other, to take a leave of absence from
employment, such Part A Participant's participation in Part A of the Plan shall
remain in effect.

                                   ARTICLE VI
                      ADMINISTRATION OF PART A OF THE PLAN

      Except as otherwise expressly provided herein, this Part A of the Plan
shall be administered pursuant to the provisions of Part C of the Plan.

                                     - 5 -


                    PART B SUPPLEMENTAL RETIREMENT BENEFITS

                                   ARTICLE I
                           PURPOSE AND SCOPE OF PART B

      The provisions of Part B of the Plan shall establish and provide
supplemental retirement benefits to employees who are (i) in a select group of
management or highly compensated employees of the Company within the meaning of
Sections 201(a)(2), 301(a)(3) and 401(a)(1) of ERISA, (ii) Officers of the
Company, and (iii) selected to participate in and receive Supplemental
Retirement Benefits pursuant to the terms and provisions of this Part B of the
Plan. The Supplemental Retirement Benefits provided to participants under Part B
of the Plan are separate and independent from Excess Retirement Benefits
provided under Part A of the Plan.

                                   ARTICLE II
                          ELIGIBILITY AND PARTICIPATION

2.1   ELIGIBILITY FOR SELECTION. In order to be eligible to be selected as a
      Part B Participant in the Plan, pursuant to Section 2.2 of this Article
      II, below, an Employee must be an Officer of the Company, who is in a
      select group of management or highly compensated employees of the Company,
      as determined by the Chief Executive Officer, or in the case of the Chief
      Executive Officer, by the Committee, in the Chief Executive Officer's (or
      Committee's, as applicable) sole and absolute discretion. An eligible
      Employee/Officer may become a Part B Participant in the Plan only by being
      selected pursuant to Section 2.2 of this Article II, below.

2.2   SELECTION OF PART B PARTICIPANTS IN THE PLAN. In order to participate in
      Part B of the Plan an eligible Employee/Officer must also be specifically
      selected by the Chief Executive Officer, or in the case of the Chief
      Executive Officer, by the Committee, to be a Part B Participant in the
      Plan., with such selection to be in the Chief Executive Officer's (or
      Committee's, as applicable) sole and absolute discretion. It is not
      intended by the Plan that every eligible Employee/Officer is required to
      be, or necessarily will be selected to be a Part B Participant in the
      Plan, and an eligible Employee/Officer who is not selected to be a Part B
      Participant in the Plan, pursuant to this Section 2.2 shall not be
      entitled to any benefit or payment under Part B of the Plan. An
      Employee/Officer is who is so selected, shall, as a condition to
      participation, complete and return to the Committee a duly executed
      written instrument confirming his/her participation in Part B of the Plan
      under the terms and conditions thereof, at the time and in the form
      prescribed by the Committee.

      Provided, that no Employee/Officer, and who is a participant in the Prior
      Frozen SERP or entitled to receive any benefit or payment under the Prior
      Frozen SERP shall be selected to be a Part B Participant in the Plan; and
      it may be made a condition to the selection of an eligible
      Employee/Officer to be a Part B Participant that he/she shall have elected
      in writing to completely terminate his/her participation in the Prior
      Frozen SERP and waive all his/her entitlement to any benefit or payment
      under the Prior Frozen SERP; and notwithstanding anything otherwise
      provided herein, any eligible Employee/Officer who becomes a Part B
      Participant shall be deemed to consent to and agree that his/her

                                     - 6 -


      participation in Part B of the Plan shall supersede and cancel any
      entitlement he/she had to any benefit or payment under the Prior Frozen
      SERP.

2.3   SCOPE OF PART B PARTICIPATION. An Employee/Officer who is eligible and is
      selected to be a Part B Participant in the Plan shall as a Part B
      Participant be entitled solely to the rights and benefits provided under
      Part B of the Plan, and such eligibility and participation shall not
      entitle such Employee/Officer to participate in Part A of the Plan or
      receive any benefit thereunder; provided, that an Employee/Officer may
      become a Part B Participant and a Part A Participant under the Plan.

2.4   DOCUMENTS, FORMS, CONFIRMING PARTICIPATION AND BENEFITS. An
      Employee/Officer's participation in Part B of the Plan may be confirmed in
      writing in one or more written instruments in such form as the Committee,
      in its sole discretion, prescribes, and which may, without limitation,
      include written forms, agreements or other instruments made or signed to
      confirm that an Employee/Officer acknowledges and accepts the terms and
      provisions of the Plan, or to confirm adjustments in determination of a
      Part B Participant's Supplemental Retirement Benefit pursuant to Article V
      of Part B of the Plan.

2.5   ELECTION TO DEFER COMPENSATION. Each Employee/Officer who becomes a Part B
      Participant in the Plan shall be required to sign and deliver to the
      Committee, or its designee, a written Election related to the payment of
      his/her Supplemental Retirement Benefit at the time or times specified by
      the Plan, including any voluntary or deemed Subsequent Elections that
      occur pursuant to the Plan subsequent to his/her Initial Participation
      Deferral Date. The written Election of a Part B Participant shall be made
      on or before the expiration of thirty (30) days after the Initial
      Participation Date of such Part A Participant, and if or to the extent any
      Part B Participant shall fail to sign and deliver such written Election
      within that time and in the manner prescribed by the Committee he/she
      shall nevertheless be considered for all purposes, by reason of his/her
      participation in the Plan, to have made an Election at his/her Initial
      Participation Date to defer compensation in the manner provided for in the
      Plan, and to have elected, agreed and consented to, and to have made any
      elections, whether upon his/her Initial Participation Date or thereafter
      in accordance with and subject to the terms and provisions of the Plan,
      including without limitation, any Subsequent Elections, as provided for
      pursuant to Article III of this Part B, below.

                                  ARTICLE III
                         SUPPLEMENTAL RETIREMENT BENEFIT

3.1   SUPPLEMENTAL RETIREMENT BENEFIT.

            A. General. Subject to Section 3.1.D. of this Article III, below,
      the Company shall pay or cause to be paid to such Part B Participant a
      Supplemental Retirement Benefit, which shall be a monthly amount which
      when combined with the Retirement Plan Benefit and existing pension
      benefits payable to the Part B Participant under the Retirement Plan will
      be equal to the product of the Part B Participant's Final Average
      Earnings, multiplied by the Part B Participant's Benefit Factor Percentage
      at his/her

                                     - 7 -


      Retirement under the Table in Section 3.1.B. of this Article III, below,
      and then multiplied by the Part B Participant's Service Factor Percentage
      at his/her Retirement under the Table in Section 3.1.C. of this Article
      III, below; subject to adjustment and reduction, if applicable, pursuant
      to Section 3.1.E. of this Article III, below.

               If an executed Plan Agreement by and between the Part B
      Participant and the Company is not executed, or an executed Plan Agreement
      of a Part B Participant does not state or specify a different amount, form
      and time of payment of a Part B Participant's Supplemental Retirement
      Benefit, then the Part B Participant shall be entitled to receive a
      Supplemental Retirement Benefit in accordance with this Section 3.1.

            B. Benefit Factor Percentage. A Part B Participant's Benefit Factor
      Percentage shall be based upon his/her age at his/her Retirement, as
      follows:



Retirement Age               Benefit Factor Percentage
- --------------               -------------------------
                          
50 & under                               50%
    51                                   51%
    52                                   52%
    53                                   53%
    54                                   54%
    55                                   55%
    56                                   56%
    57                                   57%
    58                                   58%
    59                                 58.5%
    60                                   59%
    61                                 59.5%
    62                                   60%
    63                                   60%
    64                                   60%
65 & over                                60%


            C. Service Factor Percentage. A Part B Participant's Service Factor
      Percentage shall be based upon his/her completed Years of Service at
      his/her Retirement, as follows:



Years of Service              Service Factor Percentage
- ----------------              -------------------------
                           
    1                                    5%
    2                                   10%
    3                                   15%
    4                                   20%
    5                                   25%
    6                                   30%
    7                                   35%
    8                                   40%
    9                                   45%


                                     - 8 -




Years of Service              Service Factor Percentage
- ----------------              -------------------------
                           
    10                                  50%
    11                                  55%
    12                                  60%
    13                                  65%
    14                                  70%
    15                                  75%
    16                                  80%
    17                                  85%
    18                                  90%
    19                                  95%
20 & over                              100%


            D. Excess Retirement Benefit Offset. If a Part B Participant is also
      a Part A Participant under the Plan and entitled to receive an Excess
      Retirement Benefit under Part A of the Plan, the Supplemental Retirement
      Benefit of such Part B Participant shall be offset and reduced by an
      amount equal to such Excess Retirement Benefit, whichever is payable to
      such Part B Participant pursuant to Part A of the Plan.

            E. Adjustment of Retirement Benefit Payments; Early Commencement.
      The amount of a Part B Participant's Supplemental Retirement Benefit
      payments will be reduced by reason of early commencement of payment
      thereof, based on the following table depending upon the Part B
      Participant's age when Supplemental Retirement Benefit payments to the
      Part B Participant commence:




Part B Participant           Early Commencement Reduced
Age At Commencement           Payout Percentage Factor
- -------------------          --------------------------
                          
Under 50                                 0
   50                                   50%
   51                                   55%
   52                                   60%
   53                                   65%
   54                                   70%
   55                                   75%
   56                                   80%
   57                                   85%
   58                                   90%
   59                                   95%
   60                                   97%
   61                                   99%
62 & over                              100%


3.2   PAYMENT OF SUPPLEMENTAL RETIREMENT BENEFIT. A. A. Subject to paragraphs B,
      C, D and E of this Section 3.2, below, the Supplemental Retirement Benefit
      shall be paid to the Part

                                     - 9 -


      B Participant entitled thereto or his/her Beneficiary, commencing on
      his/her Normal SERP Benefit Commencement Date, at the same time and in the
      same form of benefit, and actuarially adjusted to the same extent, as the
      corresponding Retirement Plan Benefit of such Part B Participant (or
      Beneficiary, if applicable) is paid under the Retirement Plan.

            B. Provided, that except in the case of and to the extent of a Key
      Employee Required Deferral, a Part B Participant shall be entitled to make
      a Subsequent Election to change the date of distribution and payment of
      his/her Supplemental Retirement Benefit from his/her Normal SERP Benefit
      Commencement Date to the Deferred SERP Benefit Commencement Date resulting
      from such election, if :

      (i) he/she does not commence receiving his/her Retirement Plan Benefit on
      or before his/her Normal SERP Benefit Commencement Date,

      (ii) he/she makes a corresponding Subsequent Election with respect to the
      Excess Retirement Benefit, if any, he/she is entitled to under Part A of
      the Plan, and

      (iii) he/she delivers a written notification of such Subsequent Election
      to the Committee, or its designee, in the form it prescribes, not less
      than twelve (12) months prior to his/her Normal SERP Benefit Commencement
      Date.

      The Committee, in its discretion, may allow a Part B Participant to make a
      Subsequent Election as to any Deferred SERP Benefit Commencement Date
      established for payment of his/her Supplemental Retirement Benefit under
      and subject to the same conditions and requirements as set forth above in
      this Section 3.2.B.

      Provided, that notwithstanding the foregoing, a Subsequent Election
      deferral will always occur pursuant to a Part B Participant's initial
      Election in any case in which he/she does not commence receiving his/her
      Retirement Plan Benefit on his/her Normal SERP Benefit Commencement Date,
      in accordance with such Election and paragraph D, of this Section 3.2,
      below, notwithstanding that no other written notification is delivered by
      him/her pursuant to the foregoing provisions.

            C. Nothwithstanding anything to the contrary otherwise provided in
      the Plan or in any Election or Subsequent Election of a Part B
      Participant, any Subsequent Election made under the Plan shall result in
      the first payment with respect to which such Subsequent Election is made
      being deferred to a Deferred SERP Benefit Commencement Date that is for a
      period of five (5) years from the date such payment would otherwise have
      been made; the payment and distribution of any Supplemental Retirement
      Benefit and any Excess Retirement Benefit to which a Part B Participant is
      entitled under the Plan shall in all cases be made simultaneously; and the
      payment and distribution of such Supplemental Retirement Benefit and
      Excess Retirement Benefit shall in no case commence or be made prior to
      the commencement of payment of such Part B Participant's Retirement Plan
      Benefit.

            D. Provided, further, that if the payment of the Retirement Plan
      Benefit to which a Part B Participant is entitled for any reason does not
      commence on or before a

                                     - 10 -


      then existing Deferred SERP Benefit Commencement Date, or a then existing
      Deferred SERP Benefit Commencement Date established for such Part B
      Participant under the Plan, then in such event, subject to compliance with
      all nonqualified deferred compensation plan requirements governing the
      Plan under Section 3.7, below, such Part B Participant's initial Election
      shall be followed and shall be deemed for all purposes to be a Subsequent
      Election to change the date of distribution and payment of his/her
      Supplemental Retirement Benefit to a subsequent Deferred SERP Benefit
      Commencement Date resulting from such Subsequent Election.

            E. If a Part B Participant does not commence receiving his
      Retirement Plan Benefit on his/her Normal SERP Benefit Commencement Date,
      and a Deferred SERP Benefit Commencement Date is established for the
      payment of his/her Supplemental Retirement Benefit, then upon commencement
      of payment of his/her Supplemental Retirement Benefit on his/her Deferred
      SERP Benefit Commencement Date such Part B Participant shall be entitled
      to receive a Supplemental Retirement Benefit Catch-Up Payment on that
      Deferred SERP Benefit Commencement Date, if and to the extent the payment
      of his/her Retirement Plan Benefit has commenced prior to such Deferred
      SERP Benefit Commencement Date.

            F. If a Part B Participant is a Key Employee his/her Supplemental
      Retirement Benefit shall not commence being paid until after the end of
      the Key Employee Required Deferral Period. In such case the Part B
      Participant shall receive a Key Employee Catch-Up Payment at the end of
      the Key Employee Required Deferral Period and thereafter receive
      Supplemental Retirement Benefit monthly payments in accordance with the
      Plan.

3.3   SUBSEQUENT ELECTIONS; DEFERRED SERP BENEFIT COMMENCEMENT DATE.
      Notwithstanding anything to the contrary provided herein, if a Part B
      Participant makes a Subsequent Election or is deemed to have made a
      Subsequent Election to change such time of distribution or payment of such
      Part B Participant's Supplemental Retirement Benefit that Subsequent
      Election shall result in a Deferred SERP Benefit Commencement Date being
      established for such Part B Participant based upon the time of such
      Subsequent Election. A Part B Participant's initial Election shall include
      his/her consent and agreement, to all terms and provisions of the Plan
      with respect to any Subsequent Election and the effect thereof with
      respect to the time and form of payment of any Supplemental Retirement
      Benefit he/she is entitled to receive under the Plan.

3.4   VESTING OF SUPPLEMENTAL RETIREMENT BENEFIT. Subject to Sections 3.6 and
      3.7 of this Article III, below, a Part B Participant's Supplemental
      Retirement Benefit shall unconditionally vest in such Part B Participant
      and become nonforfeitable upon the Part B Participant's completion of five
      (5) Years of Service; provided that the Supplemental Retirement Benefit
      shall not vest in a Part B Participant at the time of, or by reason of
      his/her Retirement or under any other circumstance if he/she has not
      completed five (5) Years of Service.

3.5   FORFEITABILITY OF RETIREMENT BENEFIT. Notwithstanding any provision to the
      contrary expressed or implied herein, a Part B Participant's right to
      receive a Supplemental Retirement Benefit under the Plan and such Part B
      Participant's Plan Agreement shall be

                                     - 11 -


      forfeited to the extent that such Supplemental Retirement Benefit has not
      vested as described in Section 3.4 and the Part B Participant's Plan
      Agreement.

3.6   DEATH OF PART B PARTICIPANT. In the event of the death of a Part B
      Participant prior to Retirement, an amount equal to fifty-five percent
      (55%) of his/her vested Supplemental Retirement Benefit shall be paid to
      his/her Beneficiary in the form and at the time his/her Retirement Plan
      Benefit is paid after his/her death.

3.7   NONQUALIFIED DEFERRED COMPENSATION PLAN REQUIREMENTS. Notwithstanding
      anything to the contrary expressed or implied herein, the deferral of all
      Compensation under this Plan shall be subject to the requirements set
      forth in Article XI, Section 11.1 of Part C of the Plan.

                                   ARTICLE IV
                                   BENEFICIARY

      The Beneficiary of a Part B Participant's Supplemental Retirement Benefit
shall be the beneficiary of such Part B Participant's Retirement Plan Benefit.

                                   ARTICLE V
                   SUPPLEMENTAL RETIREMENT BENEFIT ADJUSTMENTS

      The Committee shall be authorized to make and apply special adjustments in
determining the amount of a Part B Participant's Supplemental Retirement
Benefit. Such adjustments may be made from time to time by the Committee for any
Part B Participant, and may include, without limitation, the granting or deemed
accrual of additional Years of Service, the waiver of an offset of retirement
benefits provided by a prior employer, or such other adjustments as the
Committee determines, in its sole discretion; provided, however, that no such
adjustment shall be effective until it is made and expressly acknowledged in
writing by the Committee.

                                   ARTICLE VI
                                LEAVE OF ABSENCE

      If a Part B Participant is authorized by the Company for any reason,
including military, medical, or other, to take a leave of absence from
employment, such Part B Participant's Plan Agreement shall remain in effect.

                                  ARTICLE VII
                      ADMINISTRATION OF PART B OF THE PLAN

      Except as otherwise expressly provided herein, this Part B of the Plan
shall be administered pursuant to the provisions of Part C of the Plan.

                                     - 12 -


                                     PART C
                PLAN ADMINISTRATION AND MISCELLANEOUS PROVISIONS

                                   ARTICLE I
                           PURPOSE AND SCOPE OF PART C

      The purpose of Part C of the Plan is to establish and provide certain
provisions governing the administration, and interpretation and application of
all the provisions of the Plan. Unless otherwise expressly indicated, the terms
and provisions of Part C of the Plan shall be applicable to Part A, Part B and
Part C of the Plan.

                                   ARTICLE II
                          DEFINITIONS AND CONSTRUCTION

2.1 DEFINITIONS. For purposes of Parts A, B and C of the Plan, the following
phrases or terms shall have the indicated meanings unless otherwise clearly
apparent from the context:

            A. "Base Cash Compensation" shall mean the regular monthly salary
      paid to a Participant by the Company before any deductions or exclusions
      for taxes or other purposes, and excluding any vehicle allowance,
      incentives, commissions and any other special pay.

            B. "Beneficiary" shall mean the individual or individuals, or any
      trust or trusts, or the estate of a Participant entitled to receive any
      benefits in accordance with the terms of the Plan.

            C. "Board of Directors" shall mean the Board of Directors of ONEOK,
      Inc., unless otherwise indicated or the context otherwise requires.

                  (A) "Change in Control" shall mean to the extent provided by
               Treasury Regulations issued under Code Section 409A, a change in
               the ownership or effective control of the Company, or in the
               ownership of a substantial portion of the assets of the Company.

            D. "Code" shall mean the Internal Revenue Code of 1986, as amended.

            E. "Committee" shall mean the Executive Compensation Committee of
      the Board of Directors or such other Committee appointed to manage and
      administer the Plan and individual Plan Agreements in accordance with the
      provisions of Article III of this Part C of the Plan.

            F. "Company" shall mean ONEOK, Inc., an Oklahoma corporation, or any
      division or subsidiary thereof.

            G. "Compensation" shall mean the Base and Short-Term Incentive Cash
      Compensation from the Company paid to or deferred by a Participant during
      a calendar year.

                                     - 13 -


            H. "Deferred Compensation" shall mean any Excess Retirement Benefit
      or Supplemental Retirement Benefit to be paid to a Participant pursuant to
      the Plan.

            I. "Deferred Excess Retirement Benefit Payment" shall mean the
      amount of any monthly Excess Retirement Benefit that is not paid to a Part
      A Participant for any month during such Part A Participant's SERP
      Retirement Benefits Deferral Period.

            J. "Deferred Retirement Plan Benefit Commencement Date" shall mean a
      Retirement Plan Benefit Commencement Date that is later than a
      Participant's Normal SERP Benefit Commencement Date.

            K. "Deferred Retirement Plan Benefit Election Date" shall mean the
      date a Participant elects a Deferred Retirement Plan Benefit Commencement
      Date.

            L. "Deferred SERP Benefit Commencement Date" shall mean with respect
      to a Part A Participant or Part B Participant, the date that is five (5)
      years after such Participant's Normal SERP Benefit Commencement Date, or
      any existing Deferred SERP Benefit Commencement Date established under the
      Plan with respect to such Participant, as to which the Participant has
      made a Subsequent Election under the terms and provisions of the Plan.

            M. "Deferred Supplemental Retirement Benefit Payment" shall mean the
      amount of any monthly Supplemental Retirement Benefit that is not paid to
      a Part B Participant for any month during such Part B Participant's
      Supplemental Retirement Benefits Deferral Period.

            N. "Disabled" shall mean that a Participant is unable to engage in
      substantial gainful activity by reason of any medically determinable
      physical or mental impairment which can be expected to result in death or
      can be expected to last for a continuous period of not less than twelve
      (12) months, or is, by reason of any medically determinable physical or
      mental impairment which can be expected to last for a continuous period of
      not less than twelve (12) months, receiving income replacement benefits
      for a period of not less than three (3) months under an accident or health
      plan covering Employees of the Company.

            O. "Effective Date" shall mean the effective date of the Plan,
      January 1, 2005.

            P. "Election" shall mean the initial Election of a Participant to
      defer Deferred Compensation to the Participant for services performed for
      a Plan Year or other period pursuant to the Plan, which shall be on or
      before the expiration of thirty (30) days after the Initial Participation
      Date of such Participant.

            Q. "Election Date" shall mean the date of the Election of a Part A
      Participant or Part B Participant that is made or deemed made pursuant to
      the terms of the Plan.

            R. "Employee" shall mean any person who is in the regular full-time
      employment of the Company or is on authorized leave of absence therefrom,
      as

                                     - 14 -


      determined by the personnel rules and practices of the Company. The term
      does not include persons who are retained by the Company solely as
      consultants or under contract.

            S. "ERISA" shall mean the Employee Retirement Income Security Act of
      1974, as amended.

            T. "Excess Retirement Benefit" shall mean an amount equal the
      difference between (i)the Retirement Plan Benefit to which the Part A
      Participant would be entitled under the Retirement Plan if such Retirement
      Plan Benefit was computed without the restrictions or limitations imposed
      by Sections 401(a)(17) and 415(b) of the Code as now or hereafter in
      effect, less (ii) the amount of Retirement Plan Benefit payable to the
      Part A Participant under the Retirement Plan.

            U. "Excess Retirement Benefit Catch-Up Payment" means a payment
      equal to the amount of each monthly Deferred Excess Retirement Benefit
      Payment, if any, to which a Part A Participant is entitled between the
      such Part A Participant's Retirement Plan Benefit Commencement Date and
      his/her Deferred SERP Benefit Commencement Date.

            V. "Final Average Earnings" shall mean the average of the highest
      thirty-six (36) consecutive months Compensation during the last sixty (60)
      month period of an Employee's employment with the Company.

            W. "Fixed Schedule" shall mean the distribution or payment of
      compensation deferred under the Plan in a fixed schedule of distributions
      or payments that are determined and fixed at the time the deferral of such
      Compensation is first elected by the Participant.

            X. "Initial Participation Date" shall mean the date an Employee or
      Officer first becomes a Part A Participant and/or Part B Participant in
      the Plan.

            Y. "Key Employee" shall mean an Employee who is (i) an officer of
      the Company having annual Compensation greater than $130,000 (adjusted for
      inflation at the same time and in the same manner as is provided for in
      Code Section 416(i) and limited to 50 Employees of the Company, (ii) a
      5-percent owner of the Company, and (iii) a 1-percent owner of the Company
      having annual Compensation from the Company greater than $150,000.

            Z. "Key Employee Catch-Up Payment" shall mean a lump sum payment
      equal to all regularly scheduled Excess Retirement Benefit and/or
      Supplemental Retirement Benefit monthly payments to which an Part A
      Participant or Part B Participant is entitled to under the Plan but which
      are not paid on and after the commencement of payment of his/her
      Retirement Plan Benefit because of a Key Employee Required Deferral
      Period.

            AA. "Key Employee Required Deferral Period" shall mean the deferral
      of payment and distribution of an Excess Retirement Benefit or a
      Supplemental Retirement Benefit with respect to a Part A Participant or
      Part B Participant, respectively, until a date which is six (6) months
      after the date of the Separation from Service of such Participant.

                                     - 15 -


            BB. "Normal SERP Benefit Commencement Date" shall mean as to any
      Part A Participant or Part B Participant, the first day of the calendar
      month next following the date of occurrence of both (i) such Participant's
      Separation from Service with the Company, and (ii) such Participant's
      attainment of age fifty (50).

            CC. "Officer" shall mean a person who is an elected officer of the
      Company.

            DD. "Part A Participant" shall mean an Employee who is selected to
      participate in Part A of the Plan in accordance with the provisions of
      Article II of Part A of the Plan.

            EE. "Part B Participant" shall mean an Employee who is selected and
      elects to participate in Part B of the Plan in accordance with the
      provisions of Article II of Part B of the Plan.

            FF. "Performance-Based Compensation shall mean Compensation that is
      conditioned upon or subject to meeting certain requirements similar to
      those under Code Section 162(m), as more particularly provided for in
      Treasury Regulations issued under Code Section 409A.

            GG. "Plan Agreement" shall mean a form of written agreement which is
      entered into by and between the Company and an Employee selected to become
      a Participant as a condition to participation in the Plan as provided in
      Sections 2.2 and 2.4 of Article II of Part B of the Plan.

            HH. "Plan" shall mean this ONEOK, Inc. 2005 Supplemental Executive
      Retirement Plan as embodied herein and as amended from time to time.

            II. "Prior Frozen SERP" shall mean the separate preexisting ONEOK,
      Inc. Supplemental Executive Retirement Plan, terminated and frozen by the
      Board of Directors effective December 31, 2004.

            JJ. "Rabbi Trust" shall mean the trust created to hold assets which
      will be used to pay the benefits provided hereunder, as provided in
      Section 5.4 of Article V of this Part C of the Plan.

            KK. "Retirement" and "Retire" shall mean termination of an
      Employee's employment with the Company, other than termination of
      employment as a result of death of the Employee, irrespective of whether
      or not the Employee is considered to have retired under the Retirement
      Plan or for any other purpose at the time of his/her termination of
      employment with the Company.

            LL. "Retirement Age" shall mean the retirement age of a Participant
      specified in the Participant's Plan Agreement and the Plan.

            MM. "Retirement Plan" shall mean the Retirement Plan for Employees
      of ONEOK, Inc. and Subsidiaries.

                                     - 16 -


            NN. "Retirement Plan Benefit" shall mean the benefit or benefits to
      which a Part B Participant is entitled under the Retirement Plan.

            OO. "Retirement Plan Benefit Commencement Date" means the date a
      Participant commences receiving payments of his/her Retirement Benefits
      under the Retirement Plan.

            PP. "Separation from Service" shall mean the termination of a
      Participant's employment with the Company.

            QQ. "SERP Retirement Benefits Payments Deferral Period" means the
      period of time commencing on a Part A Participant's or a Part B
      Participant's Retirement Plan Benefit Commencement Date and ending on such
      Part B Participant's Deferred SERP Benefit Commencement Date.

            RR. "Service" shall mean employment of a Participant by the Company
      as a regular full-time employee.

            SS. "Short-Term Incentive Cash Compensation" shall mean any payment
      by the Company under the ONEOK, Inc. Annual Employee Incentive Plan, the
      ONEOK, Inc. Annual Officer Incentive Plan, or any other incentive or
      commission plan established by the Company to pay employees additional
      cash compensation to reward performance, except that any payment by the
      Company under the ONEOK Energy Services Company, II Incentive Plan shall
      not be considered or treated as Short-Term Incentive Cash Compensation.

            TT. "Specified Time" shall mean a specified date at which Deferred
      Compensation deferred by a Participant pursuant to the Plan is required to
      be distributed or paid and which is specified at the time the deferral of
      such Deferred Compensation is initially elected by the Participant.

            UU. "Subsequent Election" shall mean an election made by a
      Participant with respect to the time or form of distribution of payment
      Deferred Compensation deferred under the Plan that is made at any time
      after his/her Election with respect to such Deferred Compensation.

            VV. "Supplemental Retirement Benefit" shall mean the supplemental
      retirement benefit to be paid to a Part B Participant pursuant to Article
      III and other applicable provisions of Part B of the Plan.

            WW. "Supplemental Retirement Benefit Catch-Up Payment" means a
      payment equal to the amount of each monthly Deferred Supplemental
      Retirement Benefit Payment, if any, to which a Part B Participant is
      entitled and which is not paid to such Part B Participant during the
      period between such Part B Participant's Retirement Plan Benefit
      Commencement Date and his/her Deferred SERP Benefit Commencement Date.

            XX. "Totally and Permanently Disabled" means when, on the basis of
      medical evidence, it is determined that a Participant:

                                     - 17 -


               (a) is totally disabled so as to be prevented from any comparable
            employment with the Company, including a disability resulting from
            an occupational cause; and

               (b) will be disabled permanently.

            YY. "Unforeseeable Emergency" shall mean a sever financial hardship
      to the Participant resulting from illness or accident of the Participant,
      the Participant's spouse, or a dependent (as defined in Code Section
      152(a)) of the Participant, loss of the Participant's property due to
      casualty, or other similar extraordinary circumstances arising as a result
      of events beyond the control of the Participant, and it is intended and
      directed with respect to any such Unforeseeable Emergency that any amounts
      distributed under the Plan by reason thereof shall not exceed the amounts
      necessary to satisfy such emergency plus amounts necessary to pay taxes
      reasonably anticipated as a result of the distribution, after taking into
      account the extent tow which such hardship is or may be relieved through
      reimbursement or compensation by insurance or otherwise or by liquidation
      of the Participant's assets (to the extent the liquidation of such assets
      would not itself cause severe financial hardship. -

            ZZ. "Years of Service" shall include each full year, but not any
      portion of a year, during which the Participant has been employed by the
      Company or any division or subsidiary thereof.

2.2   CONSTRUCTION. The singular when used herein may include the plural unless
      the context clearly indicates to the contrary. The words "hereof",
      "herein", "hereunder", and other similar compounds of the word "here"
      shall mean and refer to the entire Plan and not to any particular
      provision or section. Whenever the words "Article" or "Section" are used
      in the Plan, or a cross reference to an "Article" or "Section" is made,
      the Article or Section referred to shall be an Article or Section of the
      same Part of the Plan unless otherwise specified.

2.3   PLAN PURPOSE. The Plan is intended to be an unfunded deferred
      compensation, excess and supplemental retirement benefit plan established
      and maintained for a select group of management and highly compensated
      employees of the Company within the meaning of Sections 201(2) and (7),
      301(a)(3), (9) and 401(a)(1) of ERISA, as provided under the respective
      provisions of Part A and Part B of the Plan, and the Company intends that
      any Participant or Beneficiary shall have the status of an unsecured
      creditor as to the Plan or any trust, fund or other arrangement
      established under or with respect to the Plan, and the Plan shall be
      construed, interpreted and administered in accordance with such intended
      purpose.

                                  ARTICLE III
                                    COMMITTEE

3.1   APPOINTMENT OF COMMITTEE.

      The general administration of the Plan, including all provisions of Part A
      and Part B of the Plan, and any Plan Agreements executed hereunder, as
      well as construction and

                                     - 18 -


      interpretation thereof, shall be vested in the Committee, the number and
      members of which shall be designated and appointed from time to time by,
      and shall serve at the pleasure of, the Board of Directors. Any such
      member of the Committee may resign by notice in writing filed with the
      Board of Directors. Vacancies shall be filled promptly by the Board of
      Directors.

3.2   COMMITTEE OFFICIALS. The Board of Directors may designate one of the
      members of the Committee as Chairman and may appoint a secretary who need
      not be a member of the Committee. The secretary shall keep minutes of the
      Committee's proceedings and all data, records, and documents relating to
      the Committee's administration of the Plan and any Plan Agreements
      executed hereunder. The Committee may appoint from its number such
      subcommittees with such powers as the Committee shall determine and may
      authorize one or more of its members or any agent to execute or deliver
      any instrument or make any payment on behalf of the Committee.

3.3   COMMITTEE ACTION. All resolutions or other actions taken by the Committee
      shall be by the vote of a majority of those present at a meeting at which
      a majority of the members are present, or in writing by all the members at
      the time in office if they act without a meeting.

3.4   COMMITTEE RULES AND POWERS. Subject to the provisions of the Plan, the
      Committee may from time to time establish rules, forms, and procedures for
      the administration of the Plan, including Plan Agreements. Except as
      herein otherwise expressly provided, the Committee shall have the
      exclusive right to interpret the Plan and any Plan Agreements, and to
      decide any and all matters arising thereunder or in connection with the
      administration of the Plan and any Plan Agreements, and it shall endeavor
      to act, whether by general rules or by particular decisions, so as not to
      discriminate in favor of or against any person. The Committee shall have
      the exclusive right to determine if a Participant has become Totally and
      Permanently Disabled with respect to a Participant (consistent with the
      Plan's definition of the term), such determinations to be made on the
      basis of such medical and/or other evidence that the Committee, in its
      sole and absolute discretion, may require. Such decisions, actions, and
      records of the Committee shall be conclusive and binding upon the Company,
      the Participants, and all persons having or claiming to have rights or
      interests in or under the Plan.

3.5   RELIANCE ON CERTIFICATES, ETC. The members of the Committee and the
      Officers and Directors of the Company shall be entitled to rely on all
      certificates and reports made by any duly appointed accountants, and on
      all opinions given by any duly appointed legal counsel. Such legal counsel
      may be counsel for the Company.

3.6   LIABILITY OF COMMITTEE. No member of the Committee shall be liable for any
      act or omission of any other member of the Committee, or for any act or
      omission on his part, excepting only his own willful misconduct. The
      Company shall indemnify and save harmless each member of the Committee
      against any and all expenses and liabilities arising out of membership on
      the Committee, excepting only expenses and liabilities arising out of a
      Committee member's own willful misconduct. Expenses against which a member
      of the Committee shall be indemnified hereunder shall include, without

                                     - 19 -


      limitation, the amount of any settlement or judgment, costs, counsel fees,
      and related charges reasonably incurred in connection with a claim
      asserted, or a proceeding brought, or settlement thereof. The foregoing
      right of indemnification shall be in addition to any other rights to which
      any such member may be entitled.

3.7   DETERMINATION OF BENEFITS. In addition to the powers hereinabove
      specified, the Committee shall have the power to compute and certify,
      under the Plan and any Plan Agreement, the amount and kind of benefits
      from time to time payable to Participants and their Beneficiaries, and to
      authorize all disbursements for such purposes.

3.8   INFORMATION TO COMMITTEE. To enable the Committee to perform its
      functions, the Company shall supply full and timely information to the
      Committee on all matters relating to the compensation of all Participants,
      their retirement, death, or other cause for termination of employment, and
      such other pertinent facts as the Committee may require.

                                   ARTICLE IV
                         ADOPTION OF PLAN BY SUBSIDIARY,
                       AFFILIATED OR ASSOCIATED COMPANIES

      Any corporation which is a subsidiary of the Company may, with the
approval of the Board of Directors, adopt the Plan and thereby come within the
definition of Company in Article I of Part C of the Plan.

                                   ARTICLE V
                               SOURCE OF BENEFITS

5.1   BENEFITS PAYABLE. Excess Retirement Benefits and Supplemental Retirement
      Benefits payable hereunder shall be paid exclusively from the general
      assets of the Company or the Rabbi Trust to be established pursuant to
      Section 5.4 of this Article V; provided, that no person entitled to
      payment hereunder shall have any claim, right, security interest, or other
      interest in any fund, trust, account, insurance contract, or asset of the
      Company which may be looked to for such payment. The Company's liability
      for the payment of benefits hereunder shall be evidenced only by the Plan
      and each Plan Agreement entered into between the Company and a
      Participant.

5.2   INVESTMENTS TO FACILITATE PAYMENT OF BENEFITS Although the Company is not
      obligated to invest in any specific asset or fund, or purchase any
      insurance contract, in order to provide the means for the payment of any
      Supplemental Retirement Benefits under the Plan, the Company may elect to
      do so, and, in such event, no Participant shall have any interest whatever
      in such asset, fund, or insurance contract. In the event the Company
      elects to purchase or causes to be purchased insurance contracts on the
      life of a Participant as a means for making, offsetting, or contributing
      to any payment, in full or in part, which may become due and payable by
      the Company under the Plan or a Participant's Plan Agreement, such
      Participant agrees to cooperate in the securing of life insurance on
      his/her life by furnishing such information as the Company and the
      insurance carrier may require, including the results and reports of
      previous Company and other insurance carrier physical examinations as may
      be requested, and taking any other

                                     - 20 -


      action which may be requested by the Company and the insurance carrier to
      obtain such insurance coverage. If a Participant does not cooperate in the
      securing of such life insurance, the Company shall have no further
      obligation to such Participant under the Plan.

5.3   OWNERSHIP OF INSURANCE CONTRACTS. The Company shall be the sole owner of
      any insurance contracts acquired on the life of a Participant with all
      incidents of ownership therein, including, but not limited to, the right
      to cash and loan values, dividends, if any, death benefits, and the right
      to termination thereof, and a Participant shall have no interest
      whatsoever in such contracts, if any, and shall exercise none of the
      incidents of ownership thereof. Provided, however, the Company may assign
      any such insurance contracts to the trustee of the Rabbi Trust.

5.4   TRUST FOR PAYMENT OF SUPPLEMENTAL RETIREMENT BENEFITS. The Company shall
      create or utilize a Rabbi Trust for the purpose of facilitating any
      retirement benefits payable hereunder. Such trust will be funded to
      provide the applicable vested Excess Retirement Benefits and Supplemental
      Retirement Benefits payable under the Plan upon the occurrence of any of
      the following events:

      a) At the Retirement of, and commencement of payment of an Excess
      Retirement Benefit or a Supplemental Retirement Benefit to a Plan
      Participant;

      b) Upon a decision by the Committee, or by the Board of Directors; or

      c) Upon a Change in Control.

      Such funding may be in the form of single premium annuities, or an amount
      sufficient for the trustee to purchase single premium annuities, or life
      insurance policies or contracts insuring the lives of Participants, as the
      case may be, from qualified and financially sound insurance companies, and
      such other forms or types of investments the Company may select from time
      to time to provide the applicable vested Excess Retirement Benefits and
      Supplemental Retirement Benefits payable under the Plan and Plan
      Agreements. Such funding and the purchase of insurance, if any, will not
      relieve the Company of its obligations to pay or cause to be paid the
      benefits hereunder.

      The Rabbi Trust may be maintained and administered to also provide for the
      funding of payment of amounts payable to participants in other deferred
      compensation and benefit plans of the Company. The funding, investments
      and administration of the Rabbi Trust in connection with such other
      separate plan or plans shall be separately administered and accounted for
      as determined to be necessary and appropriate by the Company and trustee
      pursuant to the terms of the Rabbi Trust. It shall be permissible for the
      trustee to invest funds of the Rabbi Trust in one or more forms of
      investment that is common to plans being funded thereunder.

      The Rabbi Trust shall be a grantor trust of which the Company is the
      grantor within the meaning of the Code. The principal of the Rabbi Trust
      and any earnings thereon shall be held separate and apart from other funds
      of the Company and shall be used exclusively for the uses and purposes of
      Part A Participants and/or Part B Participants in the Plan and

                                     - 21 -


      general creditors of the Company as specified hereinbelow and in the trust
      instrument. Part A Participants and Part B Participants in the Plan and
      their Beneficiaries shall have no preferred claim on, or any beneficial
      ownership in any assets of the Rabbi Trust; and any rights created under
      the Plan or any Plan Agreements, and the Rabbi Trust are to be made
      unsecured contractual rights of Part A Participants and Part B
      Participants (and their Beneficiaries, if applicable) against the Company;
      and assets held by the Rabbi Trust will be subject to the claims of the
      Company's general creditors under federal and state law in the event of
      insolvency of the Company.

                                   ARTICLE VI
                            TERMINATION OF EMPLOYMENT

      Neither the Plan nor any Plan Agreement with a Participant hereunder,
either singly or collectively, in any way obligate the Company, or any
subsidiary of the Company, to continue the employment of a Part A Participant or
a Part B Participant with the Company, or any subsidiary of the Company, nor
does either limit the right of the Company or any subsidiary of the Company at
any time and for any reason to terminate such Part A Participant's or Part B
Participant's employment. Termination of a Part A Participant's or Part B
Participant's employment with the Company, or any subsidiary of the Company, for
any reason, whether by action of the Company, subsidiary, or such a Part A
Participant or Part B Participant, shall immediately terminate such
Participant's participation in the Plan and any such Participant's Plan
Agreement, and all further obligations of either party thereunder, except as may
be provided in Article VIII of this Part C, and the Participant's Plan
Agreement. In no event shall the Plan or a Plan Agreement, either singly or
collectively, by their terms or implications constitute an employment contract
of any nature whatsoever between the Company, or any subsidiary, and a Part A
Participant or Part B Participant.

                                  ARTICLE VII
                          TERMINATION OF PARTICIPATION

      A Part A Participant and a Part B Participant reserves the right to
terminate participation in the Plan and any such Participant's Plan Agreement at
any time by giving the Company written notice of such termination not less than
30 days (i) prior to the anniversary date of any contract or contracts of
insurance on the life of such Part A Participant or Part B Participant which may
be in force and utilized by the Company in connection with the Plan, or (ii)
prior to the date a Part A Participant or Part B Participant selects for
termination if no insurance contract is in effect.

                                  ARTICLE VIII
                      TERMINATION, AMENDMENT, MODIFICATION,
                            OR SUPPLEMENT OF THE PLAN

8.1   AMENDMENT OR TERMINATION. Subject to Section 8.2, below, the Company
      reserves the right to amend, modify, supplement, or terminate the Plan,
      wholly or partially, from time to time, and at any time. The Company
      likewise reserves the right to amend, modify, or supplement any Plan
      Agreement, wholly or partially, from time to time. Such right to amend,
      modify, supplement, or terminate the Plan or any Plan Agreement, as the
      case

                                     - 22 -


      may be, shall be exercised for the Company by the Board of Directors;
      provided, that the Committee shall also be authorized to amend or modify
      the terms and provisions of the Plan, or a Plan Agreement, except that any
      amendment or modification of the Plan or Plan Agreement that changes the
      form or amount of any payment or benefit provided for under the Plan shall
      be made only by action of the Board of Directors; provided further, in the
      event of a Change in Control of the Company, for a period of two (2) years
      after the date of such Change of Control the surviving corporation may
      terminate or amend the Plan only by substitution by such corporation of
      another plan or program, or by amendments to the Plan, which provide
      benefits no less favorable to the Part A Participants or Part B
      Participants of this Plan; and upon the expiration of such two (2) year
      period such surviving corporation may thereafter terminate or amend the
      Plan or any such substituted plan subject in any case to Section 8.2,
      below.

8.2   RIGHTS AND OBLIGATIONS UPON AMENDMENT, TERMINATION. The following terms
      and conditions shall govern the rights and obligations of a Part A
      Participant or Part B Participant and the Company (including any surviving
      corporation in event of a Change of Control), respectively, with respect
      to the amendment or termination of the Plan.

            A. Notwithstanding anything to the contrary expressed or provided in
      the Plan or any Plan Agreement of a Part A Participant or Part B
      Participant, no amendment, modification or termination of the Plan, shall
      decrease a Part A Participant's or Part B Participant's accrued Excess
      Retirement Benefit or Supplemental Retirement Benefit, as applicable. For
      purposes of this Paragraph A., a Plan amendment which has the effect of
      decreasing a Part A Participant's or Part B Participant's accrued Excess
      Retirement Benefit or Supplemental Retirement Benefit, as the case may be,
      or eliminating any optional form of payment of a Participant's accrued
      Excess Retirement Benefit or Supplemental Retirement Benefit, with respect
      to benefits attributable to service before the amendment shall be treated
      as reducing an accrued Excess Retirement Benefit or Supplemental
      Retirement Benefit. If a vesting schedule under the Plan or any Plan
      Agreement is amended, a Part A Participant's and Part B Participant's
      non-forfeitable percentage, determined as of the later of the date such
      amendment is adopted or the date it becomes effective, will not be less
      than the percentage computed under Part A and Part B of the Plan, as
      applicable, without regard to such amendment.

            B. Except as provided in paragraph A of this Section 8.2, upon the
      termination of the Plan by the Board of Directors, or a termination of the
      Plan Agreement of a Participant, in accordance with the provisions for
      such termination, neither the Plan nor the Plan Agreement shall be of any
      further force or effect, and no party shall have any further obligation
      under either the Plan or any Plan Agreement so terminated, except as
      provided in the Plan or Plan Agreement with respect to accrued benefits at
      the time of such termination or as elsewhere provided in the Plan.

            C. For purposes of paragraphs A and B of this Section 8.2, the term
      "Plan" shall also mean and include any substituted plan that may be
      established in event of a Change of Control as described in Section 8.1,
      above, and the terms "Excess Retirement Benefit" and "Supplemental
      Retirement Benefit" shall also mean and include any benefit provided for
      under such a substituted plan.

                                     - 23 -


                                   ARTICLE IX
                              TREATMENT OF BENEFITS

      The Excess Retirement Benefit provided for a Part A Participant and the
Supplemental Retirement Benefit provided for a Part B Participant under the Plan
and/or under any Plan Agreement are in addition to any other benefits available
to such Participant under any other Plan, plan or agreement of the Company for
its Employees and the Participants, and, except as may be otherwise expressly
provided for, the Plan and Plan Agreements entered into hereunder shall
supplement and shall not supersede, modify, or amend any other Plan, plan or
agreement of the Company. The Excess Retirement Benefits and Supplemental
Retirement Benefits under the Plan and/or Plan Agreements entered into hereunder
shall not be considered compensation for the purpose of computing contributions
or benefits under any plan maintained by the Company, or any of its
subsidiaries, which is qualified under Section 401(a) of the Code.

                                   ARTICLE X
                     RESTRICTIONS ON ALIENATION OF BENEFITS

      No Excess Retirement Benefit or Supplemental Retirement Benefit under the
Plan or a Plan Agreement shall be subject to anticipation, alienation, sale,
assignment, pledge, encumbrance, or charge, and any attempt to anticipate,
alienate, sell, assign, pledge, encumber, or charge the same shall be void. No
Excess Retirement Benefit Supplemental Retirement Benefit under the Plan or
under any Plan Agreement shall in any manner be liable for or subject to the
debts, contracts, liabilities, or torts of the person entitled to such thereto.
If any Part A Participant or Part B Participant under the Plan or a Plan
Agreement should become bankrupt or attempt to anticipate, alienate, sell,
assign, pledge, encumber, or charge any right to a benefit under the Plan or
under any Plan Agreement, then such right or benefit shall, in the discretion of
the Committee, cease, and in such event, the Committee may, but shall have no
duty to hold or apply the same or any part thereof for the benefit of such Part
A Participant or Part B Participant, or his/her Beneficiary, in such portion as
the Committee, in its sole and absolute discretion, may deem proper.

                                   ARTICLE XI
                                  MISCELLANEOUS

11.1  Deferral of Compensation Requirements.

       The following requirements stated in this Section 11.1 shall apply to the
      Plan, to all Elections or Subsequent Elections made by Participants under
      the Plan, and to all distributions and payments made pursuant to the Plan.

            A. Any Compensation deferred under the Plan shall not be distributed
      earlier than

                  (a) Separation from Service of the Participant,

                  (b) the date the Participant becomes Disabled,

                  (c) death of the Participant,

                                     - 24 -


                  (d) a Specified Time (or pursuant to a Fixed Schedule)
            specified under the Plan at the date of deferral of such
            Compensation,

                  (e) a Change in Ownership or Control, or

                  (f) the occurrence of an Unforeseeable Emergency.

            B. Notwithstanding the foregoing, in the case of a Participant who
      is a Key Employee, no distribution shall be made before the date which is
      six (6) months after the date of the Participant's Separation from
      Service, or, if earlier, the date of death of such Participant.

            C. No acceleration of the time or schedule of any distribution or
      payment under the Plan shall be permitted or allowed, except to the extent
      provided in Treasury Regulations issued under Code Section 409A.

      If the Plan, or the Committee acting pursuant to the Plan, permits under
      any Subsequent Election by a Participant a delay in a payment or a change
      in the form of payment of Compensation deferred under the Plan, such
      Subsequent Election shall not take effect until at least twelve (12)
      months after the date on which it is made. In the case of a Subsequent
      Election related to a payment to be made upon Separation from Service of a
      Participant, at a Specified Time or pursuant to a Fixed Schedule, or upon
      a Change in Ownership or Control, the first payment with respect to which
      such Subsequent Election is made shall be deferred for a period of not
      less than five (5) years from the date such payment would otherwise have
      been made; and any such Subsequent Election related to a payment at a
      Specified Time or pursuant to a Fixed Schedule may not be made less than
      twelve (12) months prior to the date of the first scheduled payment to
      which it relates.

11.2  EXECUTION OF RECEIPTS AND RELEASES. Any payment to a Participant, a
      Participant's legal representative, or Beneficiary in accordance with the
      provisions of the Plan or any Plan Agreement executed hereunder shall, to
      the extent thereof, be in full satisfaction of all claims hereunder
      against the Company. The Company may require such Participant, legal
      representative, or Beneficiary, as a condition precedent to such payment,
      to execute a receipt and release therefor in such form as it may
      determine.

11.3  NO GUARANTEE OF INTERESTS. Neither the Committee nor any of its members
      guarantees the payment of any amounts which may be or becomes due to any
      person or entity under the Plan or any Plan Agreement executed hereunder.
      The liability of the Company to make any payment under the Plan or any
      Plan Agreement executed hereunder is limited to the then available assets
      of the Company and the Rabbi Trust established under Section 5.4 of this
      Part C.

11.4  COMPANY RECORDS. Records of the Company as to a Participant's employment,
      termination of employment and the reason therefor, reemployment,
      authorized leaves of absence, and compensation shall be conclusive on all
      persons and entities, unless determined to be incorrect.

                                     - 25 -


11.5  EVIDENCE. Evidence required of anyone under the Plan and any Plan
      Agreement executed hereunder may be by certificate, affidavit, document,
      or other information which the person or entity acting on it considers
      pertinent and reliable, and signed, made, or presented by the proper party
      or parties.

11.6  NOTICE. Any notice which shall be or may be given under the Plan or a Plan
      Agreement executed hereunder shall be in writing and shall be mailed by
      United States mail, postage prepaid. If notice is to be given to the
      Company, such notice shall be addressed to the Company at:

                      100 West Fifth Street
                      Tulsa, Oklahoma 74103

      and marked to the attention of the Secretary, Supplemental Executive
      Retirement Plan Administrative Committee; or, if notice to a Participant,
      addressed to the address shown on such Participant's most recent
      employment file with the Company.

11.7  CHANGE OF ADDRESS. Any party may, from time to time, change the address to
      which notices shall be mailed by giving written notice of such new
      address.

11.8  EFFECT OF PROVISIONS. The provisions of the Plan and of any Plan Agreement
      executed hereunder shall be binding upon the Company and its successors
      and assigns, and upon a Participant, the Participant's Beneficiary,
      assigns, heirs, executors, and administrators.

11.9  HEADINGS. The titles and headings of Articles and Sections are included
      for convenience of reference only and are not to be considered in the
      construction of the provisions hereof or any Plan Agreement executed
      hereunder.

11.10 GOVERNING LAW. All questions arising with respect to the Plan and any Plan
      Agreement executed hereunder shall be determined by reference to the laws
      of the State of Oklahoma in effect at the time of their adopting and
      execution, respectively.

                                     - 26 -


11.11 EFFECTIVE DATE. Except to the extent explicitly stated otherwise herein,
      the terms and provisions of this amended and restated Plan shall be
      effective January 1, 2005.

                                     - 27 -