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                                                                  EXHIBIT (a)(6)
 
The Board of Directors
Sheridan Healthcare, Inc.
March 24, 1999
Page 1
                      [Bowles Hollowell Connor Letterhead]
CONFIDENTIAL
 
March 24, 1999
 
Board of Directors
Sheridan Healthcare, Inc.
4651 Sheridan Street
Suite 400
Hollywood, Florida 33021
 
Members of the Board:
 
     You have asked us to advise you with respect to the fairness, from a
financial point of view, to the stockholders of Sheridan Healthcare, Inc.
("Sheridan"), excluding certain management stockholders (the "Participating
Management") who have agreed to become stockholders of Vestar/Calvary Holdings,
Inc. ("Holdings"), of the consideration to be received by such stockholders
pursuant to the terms of the Agreement and Plan of Merger, dated as of March 24,
1999 (the "Merger Agreement"), among Holdings, Vestar/Calvary, Inc.
("Purchaser") (Holdings and Purchaser are entities formed at the direction of an
affiliate of Vestar Capital Partners III, L.P. ("Vestar")), and Sheridan. The
Merger Agreement provides, among other things, for (A) Purchaser to make a
tender offer (the "Offer") to purchase for cash all outstanding shares of
Sheridan's common stock, par value $.01 per share, and Class A common stock, par
value $.01 per share (collectively, the "Common Stock"), at a price of $9.25 per
share and (B) the merger (the "Merger") of Purchaser into Sheridan, as soon as
practicable following the expiration or termination of the Offer, with (i) each
share of Common Stock being converted in the Merger into the right to receive
the amount paid per share in the Offer (the amount to be paid per share in the
Offer or the Merger, the "Consideration"), and (ii) each outstanding option to
purchase Sheridan Common Stock exercisable at a price less than $9.25 per share
being converted in the Merger into the right to receive cash in an amount equal
to the Consideration minus such exercise price, and all other options to
purchase Sheridan Common Stock being terminated.
 
     In arriving at our opinion, we have, among other things:
 
          (i) reviewed certain publicly available business and financial
     information relating to Sheridan;
 
          (ii) reviewed certain other information, including financial
     forecasts, provided to us by Sheridan, and have met with Sheridan's
     management to discuss the business and prospects of Sheridan;
 
          (iii) considered certain financial data of Sheridan and compared that
     data with similar data for publicly held companies in businesses similar to
     those of Sheridan;
 
          (iv) considered the financial terms of certain other business
     combinations and other transactions which have recently been effected;
 
          (v) reviewed the financial terms and conditions of the Merger
     Agreement; and
 
          (vi) considered such other information, financial studies, analyses
     and investigations and financial, economic and market criteria which we
     deemed relevant.
 
                         [Riverfront Plaza Letterhead]
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Board of Directors
March 24, 1999
Page  2
 
     In connection with our review, we have not assumed any responsibility for
independent verification of any of the foregoing information and have relied on
its being complete and accurate in all material respects. With respect to the
financial forecasts, we have assumed that they have been reasonably prepared on
bases reflecting the best currently available estimates and judgments of
Sheridan's management as to the future financial performance of Sheridan. In
addition, we have not made an independent evaluation or appraisal of the assets
or liabilities (contingent or otherwise) of Sheridan, nor have we been furnished
with any such evaluations or appraisals. Our opinion is necessarily based upon
financial, economic, market and other conditions as they exist and can be
evaluated on the date hereof. In connection with our engagement, we and the
Company's co-financial advisor, Salomon Smith Barney, approached third parties
to solicit indications of interest in a possible acquisition of Sheridan.
 
     We have acted as financial advisor to Sheridan in connection with the Offer
and the Merger and will receive a fee for our services, including for rendering
this opinion, a significant portion of which is contingent upon the consummation
of the Offer and the Merger. As part of our investment banking business, we are
regularly engaged in the valuation of businesses and their securities in
connection with mergers and acquisitions, negotiated underwritings, competitive
biddings, secondary distributions of listed and unlisted securities, private
placements and valuations for estate, corporate and other purposes.
 
     In the ordinary course of business, we or our affiliates may actively trade
the debt and equity securities of Sheridan for our or any such affiliate's own
account or for the account of customers and, accordingly, may hold a long or
short position in such securities. In addition, we and our affiliates in the
past may have provided investment and commercial banking products and services
for Sheridan, Vestar and their respective affiliates and other related persons.
 
     It is understood that this letter is for the information of the Board of
Directors of Sheridan in connection with its consideration of the Offer and the
Merger and does not constitute a recommendation to any stockholder as to how
such stockholders should vote on the proposed Merger or act with respect to the
Offer. Our opinion does not address the relative merits of the transaction
contemplated by the Merger Agreement as compared to any alternative business
strategies that might exist for Sheridan, nor does it address the effect of any
other business combination in which Sheridan might engage. This letter is not to
be quoted or referred to, in whole or in part, in any registration statement,
prospectus or proxy statement, or in any other document used in connection with
the offering or sale of securities, nor shall this letter be used for any other
purposes, without First Union Capital Markets Corp.'s prior written consent.
 
     Based upon and subject to the foregoing, our experience as investment
bankers, our work as described above and other factors we deem relevant, we are
of the opinion that, as of the date hereof, the Consideration is fair from a
financial point of view to holders of Common Stock (other than the Participating
Management, with respect to whom we express no opinion).
 
Very truly yours,
 
BOWLES HOLLOWELL CONNER
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BOWLES HOLLOWELL CONNER
A division of First Union Capital Markets Corp.