Document:

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                                                                    Exhibit 10.3

                           NON-SOLICITATION AGREEMENT

     This Non-Solicitation Agreement (this "AGREEMENT") is executed as of April
20, 2006 and effective as of the Effective Time (as such term is defined in the
Merger Agreement) and is by and between Petrohawk Energy Corporation, a Delaware
corporation ("PARENT"), and ________________, an individual residing in the
State of Texas ("EXECUTIVE", and together with Parent, the "PARTIES" and each
individually, a "PARTY").

                                    RECITALS

     A. Pursuant to an Agreement and Plan of Merger (the "MERGER AGREEMENT") of
even date herewith, by and among Parent, Hawk Nest Corporation, a Delaware
corporation and a wholly-owned subsidiary of Parent ("PURCHASER"), and KCS
Energy, Inc., a Delaware corporation ("COMPANY"), Parent shall acquire all of
the outstanding shares of capital stock of Company through a merger of Purchaser
with the Company and a merger of the Company with Parent (the "MERGER").

     B. The Parties have executed and delivered this Agreement in connection
with the execution of the Merger Agreement.

     C. Parent would not have entered into the Merger Agreement if Executive did
not enter into this Agreement, and Executive is receiving substantial benefits
under the Merger Agreement.

     D. Undefined capitalized terms herein are defined in the Merger Agreement.

                             STATEMENT OF AGREEMENT

     NOW, THEREFORE, the Parties, intending to be legally bound and for good and
valuable consideration, the receipt and sufficiency of which are hereby
acknowledged, hereby agree as follows:

     Section 1. Acknowledgment by Executive. Executive acknowledges that he is a
stockholder of Company and/or has Company Options and has been employed by
Company and, in such capacity, has occupied a position of trust and confidence
with Company prior to the date hereof and has become familiar with confidential
information concerning the businesses and affairs of Company and Parent
("CONFIDENTIAL INFORMATION").

     Section 2. Agreements. In consideration of the substantial benefits that
Executive is receiving under the Merger Agreement, Executive hereby agrees with
Parent as follows:

     (a) Non-Solicitation. In an effort to assure that Parent and Company will
realize the benefits of the transactions and in consideration of the substantial
benefits that Executive is receiving under the Merger Agreement, Executive
hereby agrees with Parent as follows:

     From the Effective Time until the second anniversary thereof, Executive
     shall not, directly or indirectly (i) employ or solicit for employment or
     other similar relationship with Executive or any of Executive's Affiliates
     or any other Person, any Person known to

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     Executive to be an employee of Parent, Company, or any of their Affiliates,
     or any Person known to Executive to have been an employee of Parent,
     Company, or any of their Affiliates, within the six month period
     immediately preceding such solicitation of employment (it is agreed and
     acknowledged that Executive has knowledge of all Persons who were employees
     of the Company at the Effective Time and subsequently became employees of
     Parent); (ii) encourage, induce, or attempt to induce any employee of
     Parent, Company, or any of their Affiliates to terminate such employee's
     employment or independent contractor's active contractual relationship with
     such Person; or (iii) in any manner whatsoever, encourage, incite or induce
     any customer of Company, Parent or any of their Affiliates to terminate, in
     whole or part, its business relationship with Company, Parent or any of
     their Affiliates. Notwithstanding the foregoing, Executive shall not be
     prohibited from employing or soliciting for employment or other similar
     relationship those employees of Parent, Company, or any of their
     Affiliates, who are terminated by Parent without "cause" or who terminate
     their employment with Parent for "Good Reason" as such terms are defined in
     the Company's Severance Policy or such employee's employment agreement or
     change of control agreement, as applicable,

For purposes of this Agreement, "AFFILIATE" means a Person that, directly or
indirectly, through one or more intermediaries, controls or is controlled by, or
is under common control with, such specified Person. For this definition,
"control" (and its derivatives) means the possession, directly or indirectly, or
as trustee or executor, of the power to direct or cause the direction of the
management and policies of a Person, whether through ownership of voting equity
interests, as trustee or executor, by contract or credit arrangements or
otherwise.

     (b) Use of Confidential Information. From the Effective Time until the
second anniversary thereof, Executive will not use for Executive's personal
benefit, or disclose, communicate, divulge to, or use for the direct or indirect
benefit of any Person other than Parent, Company, or any of their Affiliates any
of the Confidential Information. This Section 2(b) will be in addition to (and
not a limitation of) any legally applicable protections of Parent's or Company's
interest in confidential information, trade secrets, and the like.

     Section 3. Submission to Jurisdiction; Notification. Executive agrees to
the jurisdiction of an appropriate Governmental Authority in the State of Texas
for the enforcement of Section 2. Parent may, without notifying Executive,
notify any Person of Executive's rights and obligations under Section 2.

     Section 4. Miscellaneous.

     (a) Entire Agreement. Other than the Merger Agreement and the
Confidentiality Agreement, this Agreement constitutes the entire agreement and
understanding of the Parties in respect of its subject matters and supersedes
all prior understandings, agreements, or representations by or among the
Parties, written or oral, to the extent they relate to the subject matter
hereof.

     (b) Successors. All of the terms, agreements, covenants, representations,
warranties, and conditions of this Agreement are binding upon, and inure to the
benefit of and are enforceable by, the Parties and their respective successors.

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     (c) Assignment. The obligations of Executive are personal and may not be
assigned or delegated by him or transferred in any manner whatsoever.

     (d) Notices. All notices or communications hereunder will be in writing
(including facsimile or other writing) addressed as follows:

               If to Parent:

               Petrohawk Energy Corporation
               1100 Louisiana, Suite 4400
               Houston, Texas 77002
               Facsimile: (832) 204-2800
               Attn: Floyd C. Wilson

               Copy to (which will not constitute notice):

               Hinkle Elkouri Law Firm L.L.C.
               301 N. Main, Suite 2000
               Wichita, Kansas 67202
               Facsimile: (316)-660-6011
               Attn: David S. Elkouri

               If to Executive:

               ______________________________

               ______________________________

               ______________________________

               Facsimile: ___________________

Any such notice or communication shall be deemed given (i) when made, if made by
hand delivery, and upon confirmation of receipt, if made by facsimile, (ii) one
business day after being deposited with a next-day courier, postage prepaid, or
(iii) three business days after being sent certified or registered mail, return
receipt requested, postage prepaid, in each case addressed as above (or to such
other address as such party may designate in writing from time to time).

     (e) Specific Performance; Remedies. Executive acknowledges and agrees that
Parent, Company and their Affiliates would be damaged irreparably if any
provision of this Agreement is not performed in accordance with its specific
terms or is otherwise breached. Accordingly, Executive agrees that the Parent,
Company and their Affiliates will be entitled to pursue an injunction or
injunctions to prevent breaches of the provisions of this Agreement and to
enforce specifically this Agreement and its terms and provisions in any action
instituted in any court of the United States or any state thereof having
jurisdiction over the Parties and the matter, in addition to any other remedy to
which they may be entitled at law or in equity; provided, however, that the
foregoing remedies will in no way limit any other remedies that Parent, Company
and their Affiliates may have.

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     (f) Time. Time is of the essence in the performance of this Agreement.

     (g) Counterparts. This Agreement may be executed in two or more
counterparts, each of which will be deemed an original but all of which together
will constitute one and the same instrument.

     (h) Headings. The section and subsection headings contained in this
Agreement are inserted for convenience only and will not affect in any way the
meaning or interpretation of this Agreement.

     (i) Governing Law. This Agreement and the performance of the Parties'
obligations hereunder will be governed by and construed in accordance with the
laws of the State of Texas, without giving effect to any choice of law
principles.

     (j) Submission to Jurisdiction. Each Party submits to the non-exclusive
jurisdiction of any state or federal court sitting in Harris County, Texas, in
any action arising out of or relating to this Agreement and agrees that all
claims in respect of the action may be heard and determined in any such court.
Each Party agrees that a final judgment in any action so brought will be
conclusive and may be enforced by action on the judgment or in any other manner
provided at law or in equity. Each Party waives any defense of inconvenient
forum to the maintenance of any action so brought and waives any bond, surety,
or other security that might be required of any other Party with respect
thereto.

     (k) Amendments and Waivers. No amendment, modification, replacement,
termination, or cancellation of any provision of this Agreement will be valid,
unless the same will be in writing and signed by the Parties.

     (l) Attorneys' Fees; Expenses. If any action at law or in equity, including
any action for declaratory or injunctive relief, is brought to enforce or
interpret the provisions of this Agreement, the substantially prevailing party
shall be entitled to recover reasonable attorneys' fees from the non-prevailing
party, which fees may be set by the court in the trial of such action or may be
enforced in a separate action brought for that purpose, and which fees shall be
in addition to any other relief which may be awarded. Except as otherwise
expressly provided in this Agreement, each Party will bear its own costs and
expenses incurred in connection with the preparation, execution and performance
of this Agreement; provided that Company shall bear the costs and expenses
incurred by Executive in connection with negotiating this Agreement.

     (m) Termination of Merger Agreement. If the Merger Agreement terminates,
this Agreement shall automatically terminate and be of no force or effect.

                            [SIGNATURE PAGE FOLLOWS]

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     IN WITNESS WHEREOF, the parties have executed and delivered this
Non-Solicitation Agreement as of the date first above written.

                                        PETROHAWK ENERGY CORPORATION

                                        By:
                                            ------------------------------------
                                        Name: Floyd C. Wilson
                                        Title: Chairman, President and Chief
                                               Executive Officer

                                        EXECUTIVE

                                        ----------------------------------------
                                        Name:                     , individually
                                              --------------------<PAGE>
                                                                    EXHIBIT 10.4

                                AMENDMENT TO THE
                                KCS ENERGY, INC.
                     2001 EMPLOYEE AND DIRECTORS STOCK PLAN

This Amendment to the KCS Energy, Inc. 2001 Employee and Directors Stock Plan
(the "PLAN"), made pursuant to the right to amend reserved under Section 7.9 of
the Plan, amends and modifies the Plan as follows:

1.   The provisions of Section 1.2 of the Plan shall be amended by adding a new
     Section 1.2.34, effective as of April 20, 2006, to read as follows:

          1.2.34 "Cause" means the occurrence of any of the following events:
          (i) the commission by Participant of an act of willful misconduct in
          any material respect including, but not limited to, the willful
          violation of any material law, rule, regulation or cease and desist
          order applicable to Participant or the Company (other than a law, rule
          or regulation relating to a minor traffic violation or similar
          offense), or an act which constitutes a breach of a fiduciary duty
          owed to the Company by Participant involving personal profit; (ii) the
          commission by Participant of an act of dishonesty relating to the
          performance of Participant's duties, habitual unexcused absence from
          work, willful failure to perform duties in any material respect (other
          than any such failure resulting from Participant's incapacity due to
          physical or mental illness or disability), or gross negligence in the
          performance of duties resulting in damage or injury to the Company,
          its reputation or goodwill (provided, however, that in the event of
          Participant's willful failure to perform duties in any material
          respect, Participant shall be provided with written notice of such
          event and shall be provided with a reasonable opportunity, and in no
          event more than thirty (30) days, to cure such failure to perform his
          duties); or (iii) any felony conviction of Participant or any
          conviction involving dishonesty, fraud or breach of trust (other than
          for a minor traffic violation or similar offense), whether or not in
          the line of duty.

2.   The provisions of Section 1.2 of the Plan shall be amended by adding a new
     Section 1.2.35, effective as of April 20, 2006, to read as follows:

          1.2.35 "Change in Control" means the first to occur of any of the
          following events which occurs at any time after the Effective Date:
          (i) Any "person" (as the term is used in Sections 13(d) and 14(d) of
          the Exchange Act, other than a trustee or other fiduciary holding
          securities under an executive benefit plan of the Company or any of
          its Subsidiaries, becomes the beneficial owner (as defined in Rule
          13d-3 under the Exchange Act), directly or indirectly, of securities
          of the Company representing more than 25% of the combined voting power
          of the Company's then outstanding securities; (ii) individuals who are
          members of the Board on the date of this Agreement (the "Incumbent
          Board") cease for any reason to constitute at least a majority of the
          Board, provided that any person becoming a director subsequent to the
          date of this Agreement in replacement for a director who has died or
          become disabled and whose election was approved by a vote of at least
          a majority of the directors comprising the Incumbent Board, or whose
          nomination for election by the Company's stockholders was approved by
          a nominating committee serving under an Incumbent Board, shall be
          considered a member of the Incumbent Board; (iii) a merger or
          consolidation of the Company with any other corporation or other
          business entity, other than a merger or consolidation which would
          result in the combined voting power of the Company's securities
          outstanding immediately prior thereto continuing to represent (either
          by remaining outstanding or by being converted into voting

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          securities of the surviving entity) at least 51% of the combined
          voting power of the securities of the Company or such surviving entity
          outstanding immediately after such merger or consolidation; or (iv) a
          sale or disposition by the Company of all or substantially all of the
          Company's assets.

3.   The provisions of Section 2.2.7 of the Plan shall be amended by adding a
     new Section 2.2.7.3, effective as of April 20, 2006, to read as follows:

          2.2.7.3 Change in Control. In the event of the occurrence of an
          involuntary termination of Participant's employment with or service as
          a director of the Company or any Subsidiary (other than for Cause) at
          any time within 12 months following a Change in Control, the Option
          may be exercised by Participant until the earlier of the expiration of
          the Option Period or the date that is three (3) months following the
          termination of the Participant's employment or service, and the Option
          shall thereafter terminate and cease to be exercisable.

4.   The provisions of Section 2 of the Plan shall be amended by adding a new
     Section 2.4, effective as of April 20, 2006, to read as follows:

          2.4 The Option may, but need not, vest and therefore become
          exercisable in periodic installments that may, but need not, be equal.
          The Option may be subject to such other terms and conditions on the
          time or times when it may be exercised (which may be based on
          performance or other criteria) as the Administrator may deem
          appropriate. The vesting provisions of individual Options may vary. No
          Option may be exercised for a fraction of a share of Common Stock. The
          Administrator in its discretion may provide for an acceleration of
          vesting and exercisability in the terms of any Option agreement in the
          event a Change in Control occurs, in the event of a Participant's
          death while employed or serving as a director, in the event of a
          Participant's Total and Permanent Disability, or in the event of a
          Participant's Retirement. In the event of the occurrence of an
          involuntary termination of Participant's employment with or service as
          a director of the Company or any Subsidiary (other than for Cause) at
          any time within 12 months following a Change in Control, the Option
          shall become 100% vested and exercisable.

5.   The provisions of Section 5.1 of the Plan shall be amended by revising the
     last sentence of such Section, effective as of April 20, 2006, to read as
     follows:

          Notwithstanding the foregoing or anything in Section 5.2 to the
          contrary, all restrictions shall lapse or terminate with respect to
          all Restricted Stock upon death or Total and Permanent Disability
          while employed or Retirement of the Participant, or upon the
          occurrence of an involuntary termination of Participant's employment
          with or service as a director of the Company or any Subsidiaries
          (other than for Cause) at any time within 12 months following a Change
          in Control. The Restricted Stock shall become 100% vested on such
          events and the restrictions on transfer shall lapse.

6.   Except as expressly provided herein, the Plan shall remain unchanged and in
     full force and effect.

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IN WITNESS WHEREOF, KCS Energy, Inc., by its duly authorized officer, has caused
this Amendment to be executed as of April 20, 2006.

                                        KCS ENERGY, INC.

                                        By: /s/ James Christmas
                                            ------------------------------------
                                            James Christmas,
                                            Chairman and Chief Executive Officer

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