EXHIBIT 10.56
                         SEVERANCE AND RELEASE AGREEMENT

      This Severance Agreement and Release ("Agreement") is entered into as of
this 26th day of April 2006, hereinafter "Execution Date," by and between Peter
Foster (hereinafter "Employee"), Cardiac Science Corporation, a Delaware
corporation (hereinafter the "Company"). Employee and the Company are sometimes
collectively referred to as the "Parties."

      1. Employee is currently employed by the Company as VP, Public Access
Defibrillator/ AED Sales. The parties expect that, barring unforeseen
circumstances, Employee's employment with the Company is to terminate April 30,
2006 (hereinafter "Termination Date"). The parties have agreed to avoid and
resolve any alleged existing or potential disagreements between them arising out
of or connected with Employee's employment with the Company. The Company
expressly disclaims any wrongdoing or any liability to Employee.

      2. The Company agrees to provide Employee the following severance
benefits, after the expiration of the seven-day revocation period described in
Paragraph 14 upon which the Agreement becomes effective (hereinafter "Effective
Date"), provided Employee has not revoked this Agreement as described therein:

1)    Per paragraph 7, subsection (b)(ii) (1), (2) and (3) of Employment
      Agreement:

      a)    Payment of severance benefits of three (3) months of regular
            bi-weekly salary to be paid over the Severance period and in
            accordance with standard payroll practices, following the Effective
            Date of the Agreement, less employee withholding for income tax
            purposes and any amounts owed by Employee to the Company in
            accordance with the Company's regular payroll practices. Employee
            agrees that said payment will be mailed to his home commencing on
            the next regular payroll date after the Effective Date.

      b)    If any, payment of pro rata bonus for achievement of sales targets,
            if achieved, for the period beginning January 1, 2006 and ending at
            date of termination. Payment of pro-rata bonus, if any, to be paid
            on the next regularly scheduled payroll in accordance with standard
            payroll practices, less employee withholding for income tax
            purposes, following the Effective Date of the Agreement.

      c)    Employer subsidy of employer portion of health benefits (medical,
            dental and vision) as elected under COBRA continuation for the three
            (3) month severance period, following the Effective Date of the
            Agreement.

      d)    Stock options granted as an employee of Cardiac Science Inc (CSI)
            were fully vested at the close of the merger. The options were
            converted into options of the new Cardiac Science Corporation in
            accordance with the established conversion formulas. Following your
            termination date of April 30, 2006 you have ninety (90) days to
            exercise the vested stock options, or the options will automatically
            cancel.

            The stock options granted in November, 2005 of the merged-entity,
            Cardiac Science Corporation, are fully vested on the date of
            issuance. Following your termination date of April 30, 2006 you have
            ninety (90) days to exercise these vested stock options, or the
            options will automatically cancel.

                                                                              1.

2)    In addition and for special consideration for a transition period and
      periodic inquiries during the severance period, and following the
      Effective Date of the Agreement:

      a)    Severance benefits of five (5) months of regular bi-weekly salary as
            a lump sum in accordance with standard payroll practices, following
            the Effective Date of the Agreement, less employee withholding for
            income tax purposes; and

      b)    Lump sum payment of $35,000 for move of your household goods; and

      c)    Employer subsidy of Employer portion of health insurance
            continuation under COBRA guidelines for a period of 15 months, in
            addition to subsidy period defined in 1.c., (total COBRA eligibility
            period for qualifying event is 18 months) or until upon acceptance
            of new employment.

3)   As of your Termination Date the Company will pay you all accrued and unused
     vacation earned through April 30, 2006, on the customary payroll date
     following your separation, which is subject to payroll withholding for
     income tax purposes.

4)   During the Employee selected severance period, defined in 2 (a), Employee
     agrees to notify the Company, in writing, upon acceptance of full time
     employment or engagement in any consultative activity that may be deemed a
     competitive activity. This is defined as a business that directly competes
     with the business conducted by the Company and derives at least 25% of its
     revenue from the sales of AEDs or Cardiac monitoring products. Employee
     agrees that upon acceptance of employment with a competitor, as defined,
     the Company has no further obligation for the paid severance benefits after
     his date of employment acceptance, and he shall repay the Company the pro
     rata portion of the Company paid lump-sum severance from the date of his
     employment acceptance to the end of the severance period.

5)   Employee specifically acknowledges and agrees that this consideration
     exceeds the amount he would otherwise be entitled to receive upon
     termination of his employment, and that these payments and other benefits
     are in exchange for entering into this Agreement. Employee agrees that he
     will not at any time seek consideration from the Company other than what is
     set forth in this Agreement. Employee specifically acknowledges and agrees
     that the Company has made no representations to him regarding the tax
     consequences of any amounts received by him or for his benefit pursuant to
     this Agreement. In consideration for the mutual promises and agreements
     contained herein, and for other valuable consideration, Employee agrees to
     pay all federal or state taxes, if any, which are required by law to be
     paid with respect to this Agreement, save and except those amounts withheld
     by the Company in satisfaction of such taxes as provided in Paragraphs 1
     (a) and (b), 2 (a) (b) or (c), and 3 above. Employee further agrees to
     indemnify and hold the Company, its predecessors, officers, directors,
     employees, attorneys, representatives, successors and assigns harmless from
     any claims, demands, deficiencies, levies, assessments, executions,
     judgments or recoveries by any governmental entity against the Company, or
     any of the foregoing persons or entities, for any amounts claimed due on
     account of this Agreement or pursuant to claims made under any federal or
     state tax laws, and any costs, expenses or damages sustained by them by
     reason of any such claims, including any amounts paid by the Company, its
     predecessors, officers, directors, employees, attorneys, representatives,
     successors and assigns as taxes, attorneys' fees, deficiencies, levies,
     assessments, fines, penalties, interest or otherwise.

                                                                              2.

6)   Employee represent that he has not filed, and will not file, any
     complaints, lawsuits, administrative complaints or charges arising from or
     relating to employment with, or termination of employment from, the
     Company. Notwithstanding the provisions of any law stating that a general
     release does not extend to claims which the creditor does not know of or
     suspect to exist in his favor at the time of executing the release,
     Employee agrees to release the Company, its Board of Directors, officers,
     employees, agents and assigns, from any and all claims, charges,
     complaints, causes of action or demands of whatever kind or nature that
     Employee now has or has ever had against the Company, whether known or
     unknown, arising from or relating to your employment with or discharge from
     the Company, including but not limited to: wrongful or tortious
     termination, specifically including actual or constructive termination in
     violation of public policy; implied or express employment contracts and/or
     estoppel; discrimination and/or retaliation under any federal, state or
     local statute or regulation, specifically including any claims Employee may
     have under the Fair Labor Standards Act, Age Discrimination in Employment
     Act, the Older Workers Benefit Protection Act, the Americans with
     Disabilities Act, Title VII of the Civil Rights Act of 1964 as amended, the
     Family and Medical Leave Act, the Washington Minimum Wage Act, and the
     Washington Law Against Discrimination; any and all claims brought under any
     applicable state employment discrimination or other statutes; any claims
     brought under any federal or state statute or regulation for non-payment of
     wages or other compensation (including bonuses due after the Separation
     Date), and libel, slander, or breach of contract other than the breach of
     this Agreement. This release specifically excludes claims, charges,
     complaints, causes of action or demands of whatever kind or nature that
     post-date the Separation Date or the Effective Date, whichever is later,
     and that are based on factual allegations that do not arise from or relate
     to your present employment with or discharge from the Company

7)   Subject to certain exceptions noted below and elsewhere within this
     Agreement, on the Separation Date, you agree to return to the Company all
     Company documents (and copies thereof) and other Company property that you
     have in your possession or control, including, but not limited to, Company
     files, notes, drawings, records, business plans and forecasts, financial
     information, specifications, training materials, computer-recorded
     information, tangible property including, but not limited to, entry cards,
     identification badges and keys, and any materials of any kind that contain
     or embody any proprietary or confidential information of the Company (and
     all reproductions thereof).

8)   You acknowledge and affirm that you have previously executed a
     Non-Disclosure Agreement (confidentiality agreement) on August 30, 2004,
     that your obligations not to use or disclose the Company's confidential
     information are ongoing, and that the terms and conditions of said
     confidentiality agreement are not affected by this Agreement. You agree to
     return all property belonging to the Company prior to the Separation Date.

9)    Communications

      a)    The Employee and the Company shall draft and agree upon the content
            of any announcement regarding your separation.

      b)    Both the Employee and the Company agree not to disparage the other
            party, and the other party's officers, directors, employees,
            shareholders, affiliates and agents, in any manner likely to be
            harmful to them and their business reputation or personal
            reputation; provided that both the Employee and the Company shall
            respond accurately and fully to any question, inquiry or request for
            information when required by law or legal process.

                                                                              3.

10)   The provisions of this Agreement will be held in strictest confidence by
      you and the Company and will not be publicized or disclosed in any manner
      whatsoever, provided, however, that: (a) Employee may disclose this
      Agreement to immediate family, attorney, accountant and financial advisor,
      and as necessary in seeking consulting work or employment; (b) the Company
      may disclose this Agreement as may be necessary in the conduct of its
      business, including but not limited to, required filings with the
      Securities and Exchange Commission, and other public announcements
      required as a publicly-traded company; and (c) the parties may disclose
      this Agreement as may be necessary to enforce its terms or as otherwise
      required by law. In particular, and without limitation, Employee will not
      disclose the provisions of this Agreement to any current or former
      employee of the Company, except as required by law.

11)   Employee warrants that no promise or inducement has been offered for this
      Agreement other than as set forth herein and that this Agreement is
      executed without reliance upon any other promises or representations, oral
      or written. Any modification of this Agreement must be made in writing and
      be signed by Employee and the Company. This Agreement supersedes all prior
      understandings between the Parties and represents the entire Agreement
      between the Parties with respect to all matters involving Employee's
      employment with or termination from the Company, except as stated herein.

12)   If any provision of this Agreement or compliance by Employee or the
      Company with any provision of this Agreement constitutes a violation of
      any law, or is or becomes unenforceable or void, then such provision, to
      the extent only that it is in violation of law, unenforceable or void,
      will be deemed modified to the extent necessary so that it is no longer in
      violation of law, unenforceable or void, and such provision will be
      enforced to the fullest extent permitted by law. If such modification is
      not possible, said provision, to the extent that it is in violation of
      law, unenforceable or void, will be deemed severable from the remaining
      provisions of this Agreement, which provisions will remain binding on both
      Employee and the Company. This Agreement is governed by the laws of the
      State of Washington.

13)   The King County Superior Court of Washington shall have exclusive
      jurisdiction of any lawsuit arising from or relating to Employee's
      employment with, or termination from, the Company, or arising from or
      relating to this Agreement. Employee consents to such venue and personal
      jurisdiction. The prevailing party in any such lawsuit will be entitled to
      an award of attorneys' fees and reasonable litigation costs. Employee
      agrees that he will indemnify and hold the Company harmless from any
      breach of this Agreement by Employee. EMPLOYEE FURTHER AGREES THAT IF HE
      CHALLENGES THIS AGREEMENT OR FILES ANY CLAIMS AGAINST THE COMPANY ARISING
      FROM OR RELATING TO HIS EMPLOYMENT WITH, OR TERMINATION FROM, THE COMPANY,
      EXCLUDING ANY CLAIM CHALLENGING THE VALIDITY OF HIS WAIVER OF RIGHTS UNDER
      THE AGE DISCRIMINATION IN EMPLOYMENT ACT, HE WILL RETURN ALL MONIES AND
      BENEFITS RECEIVED BY HIM FROM THE COMPANY PURSUANT TO THIS AGREEMENT. In
      the event Employee challenges the validity of his waiver of rights under
      the Age Discrimination in Employment Act, he agrees that the Company may
      recover money and benefits paid under this Agreement if Employee's
      challenge and subsequent Age Discrimination in Employment Act claim are
      successful and he obtains a monetary award.

                                                                              4.

14)   Employee specifically agrees and acknowledges: (A) that waiver of rights
      under this Agreement is knowing and voluntary as required under the Older
      Workers Benefit Protection Act; (B) that he understands the terms of this
      Agreement; (C) that he has been advised in writing by the Company to
      consult with an attorney prior to executing this Agreement; (D) that the
      Company has given him a period of up to twenty-one (21) days within which
      to consider this Agreement; (E) that, following execution of this
      Agreement he has seven (7) days in which to revoke his agreement to this
      Agreement and that, if he choose not to so revoke, the Agreement shall
      then become effective and enforceable and the payment and extension of
      benefits listed above shall then be made to him in accordance with the
      terms of this Agreement; and (F) nothing in this Agreement shall be
      construed to prohibit him from filing a charge or complaint, including a
      challenge to the validity of the waiver provision of this Agreement, with
      the Equal Employment Opportunity Commission or participating in any
      investigation conducted by the Equal Employment Opportunity Commission.
      However, he has waived any right to monetary relief. To cancel this
      Agreement, he understands that he must give a written revocation to
      Company headquarters either by hand delivery or certified mail within the
      seven-day period. If Employee revokes the Agreement, it will not become
      effective or enforceable and Employee will not be entitled to any of the
      benefits set forth above.

15)   Employee further specifically agrees that modifications to this Agreement,
      whether material or immaterial, do not restart the running of the
      twenty-one (21) day period referenced in Paragraph 14.

16)   This Agreement shall be binding upon the parties hereto and upon their
      heirs, administrators, representatives, executors, successors, employees,
      agents and assigns, and shall inure to the benefit of said parties and
      each of them and to their heirs, administrators, representatives,
      executors, successors, employees, agents and assigns. Employee expressly
      warrants that he has not transferred to any person or entity any rights,
      causes of action, or claims released in this Agreement.

17)   This Agreement in no way alters the at-will nature of Employee's
      employment with the Company through and including the Separation Date.

18)   EMPLOYEE ACKNOWLEDGES AND AGREES THAT HE HAS CAREFULLY READ AND
      VOLUNTARILY SIGNED THIS AGREEMENT, THAT HE HAS HAD AN OPPORTUNITY TO
      CONSULT WITH AN ATTORNEY OF HIS CHOICE, AND THAT HE SIGNS THIS AGREEMENT
      WITH THE INTENT OF RELEASING THE COMPANY AND ITS OFFICERS, DIRECTORS,
      EMPLOYEES AND AGENTS FROM ANY AND ALL CLAIMS.

ACCEPTED AND AGREED TO:



/s/ JOHN HINSON                                 /s/ PETER L. FOSTER
- ------------------------------------            -------------------------------
John Hinson, Chief Executive Officer            Peter L. Foster
Cardiac Science Corporation                     Employee's Signature

Dated:  April 26, 2006                          Dated:  April 26, 2006
- ------------------------------------            -------------------------------

                                                                              5.