Form of Letter Agreement - Herbert C. Williamson

Exhibit 10.4

HERBERT C. WILLIAMSON LETTER AGREEMENT

April [__], 2006

JK Acquisition Corp.
5847 San Felipe, Suite 4350
Houston, Texas 77057

Ferris, Baker Watts, Incorporated
7601 Lewinsville Road, Suite 450
McLean, Virginia 22102

Re: Initial Public Offering

Gentlemen:

     The undersigned director and stockholder of JK Acquisition Corp. (“Company”), in consideration of Ferris, Baker Watts, Incorporated (“FBW”) entering into a letter of intent (“Letter of Intent”) to underwrite an initial public offering of the securities of the Company (“IPO”) and embarking on the IPO process, hereby agrees as follows (certain capitalized terms used herein are defined in paragraph 11 hereof):

     1. If the Company solicits approval of its stockholders of a Business Combination, the undersigned will vote all Shares of Common Stock of the Company, including the Insider Shares and IPO Shares, owned by him in accordance with the majority of the votes cast by the holders of the IPO Shares.

     2. The undersigned will escrow his Insider Shares until six months after the consummation of a Business Combination subject to the terms of a Stock Escrow Agreement which the Company will enter into with the undersigned and an escrow agent acceptable to the Company.

     3. In the event that the Company fails to consummate a Business Combination within 18 months from the effective date (“Effective Date”) of the registration statement relating to the IPO (or 24 months under the circumstances described in the prospectus relating to the IPO), the undersigned will take all reasonable actions within his power to cause the Company to liquidate as soon as reasonably practicable. The undersigned hereby waives any and all right, title, interest or claim of any kind (“Claim”) in or to any distribution of the Trust Fund (as defined in the Letter of Intent) with respect to his Insider Shares and waives any Claim the undersigned may have in the future as a result of, or arising out of, any contracts or agreements with the Company and will not seek recourse against the Trust Fund for any reason whatsoever.

4. [Intentionally Omitted.]

     5. The undersigned acknowledges and agrees that the Company will not consummate any Business Combination which involves a company which is affiliated with any of the Insiders unless the Company obtains an opinion from an independent investment banking firm reasonably acceptable to FBW that the business combination is fair to the Company’s stockholders from a financial perspective.

     6. Neither the undersigned, any member of the family of the undersigned, or any affiliate of the undersigned will be entitled to receive or accept a finder’s fee or any other compensation in the event the undersigned, any member of the family of the undersigned or any affiliate of the undersigned originates a Business Combination.

     7. The undersigned agrees to be a director of the Company until the earlier of the consummation by the Company of a Business Combination or the liquidation of the Company. The undersigned’s biographical

information furnished to the Company and FBW and attached hereto as Exhibit A is true and accurate in all respects, does not omit any material information with respect to the undersigned’s background and contains all of the information required to be disclosed pursuant to Section 401 of Regulation S-K, promulgated under the Securities Act of 1933. The undersigned’s Questionnaire furnished to the Company and FBW and annexed as Exhibit B hereto is true and accurate in all respects. The undersigned represents and warrants that:

     8. The undersigned has full right and power, without violating any agreement by which he is bound, to enter into this letter agreement and to serve as a director of the Company.

     9. Neither the undersigned, any member of the family of the undersigned, nor any affiliate of the undersigned will be entitled to receive and will not accept any compensation for services rendered to the Company prior to the consummation of the Business Combination; provided that the undersigned shall also be entitled to reimbursement from the Company for his out-of-pocket expenses incurred in connection with seeking and consummating a Business Combination.

     10. The undersigned authorizes any employer, financial institution, or consumer credit reporting agency to release to FBW and its legal representatives or agents (including any investigative search firm retained by FBW) any information they may have about the undersigned’s background and finances (“Information”), purely for the purposes of the Company’s IPO (and shall thereafter hold such information confidential). Neither FBW nor its agents shall be violating the undersigned’s right of privacy in any manner in requesting and obtaining the Information and the undersigned hereby releases them from liability for any damage whatsoever in that connection.

     11. As used herein, (i) a “Business Combination” shall mean an acquisition by merger, capital stock exchange, asset or stock acquisition, reorganization or otherwise, of an operating business selected by the Company; (ii) “Insiders” shall mean all officers, directors and stockholders of the Company immediately prior to the IPO; (iii) “Insider Shares” shall mean all of the shares of Common Stock of the Company owned by an Insider prior to the closing of the IPO; and (iv) “IPO Shares’ shall mean the shares of Common Stock issued in the Company’s IPO.