Exhibit (d)(19)

VOTING AGREEMENT

THIS VOTING AGREEMENT (this “Agreement”) is dated as of August 28, 2006, by and among Knight Holdco LLC, a Delaware limited liability company (“Parent”), Knight Acquisition Co., a Kansas corporation and wholly-owned subsidiary of Parent (“Merger Sub,” and, together with Parent, the “Purchaser Parties”) and the Persons executing this Agreement as “Stockholders” on the signature page hereto (each, a “Stockholder” and collectively, the “Stockholders”).

RECITALS

WHEREAS, simultaneously with the execution of this Agreement, the Purchaser Parties and Kinder Morgan, Inc., a Kansas corporation (the “Company”), have entered into an Agreement and Plan of Merger, as it may be amended, supplemented, modified or waived from time to time (the “Merger Agreement”), which provides, among other things, for the Merger of Merger Sub with and into the Company, upon the terms and subject to the conditions set forth therein;

WHEREAS, each Stockholder is the record and Beneficial Owner of, and has the sole right to vote and dispose of, that number of Shares set forth next to such Stockholder’s name on Schedule A hereto; and

WHEREAS, as an inducement to the Purchaser Parties entering into the Merger Agreement and incurring the obligations therein, the Purchaser Parties have required that each Stockholder enter into this Agreement.

NOW, THEREFORE, the parties hereto, intending to be legally bound, agree as follows:

I. CERTAIN DEFINITIONS

Section 1.1 Capitalized Terms. Capitalized terms used in this Agreement and not defined herein have the meanings ascribed to such terms in the Merger Agreement.

Section 1.2 Other Definitions. For the purposes of this Agreement:

(a) “Beneficial Owner” or “Beneficial Ownership” with respect to any securities means having “beneficial ownership” of such securities (as determined pursuant to Rule 13d-3 under the Exchange Act).

(b) “Expiration Time” has the meaning set forth in Section 2.1.

(c) “Investor Members” refers to GS Capital Partners V Fund, L.P., The Carlyle Group, Carlyle/Riverstone Energy Partners III, L.P. and AIG Global Asset Management Holdings Corp.

(d) “Legal Actions” means any claims, actions, suits, demand letters, judicial, administrative or regulatory proceedings, or hearings, notices of violation, or investigations.

(e) “Owned Shares” has the meaning set forth in Section 2.1.

(f) “Permits” means all authorizations, licenses, consents, certificates, registrations, approvals, orders and other permits of any Governmental Entity.

(g) “Representative” means, with respect to any particular Person, any director, officer, employee, agent or other representative of such Person, including any consultant, accountant, legal counsel or investment banker.

(h) “Shares” has the meaning ascribed thereto in the Merger Agreement, and will also include for purposes of this Agreement all shares or other voting securities into which Shares may be reclassified, sub-divided, consolidated or converted and any rights and benefits arising therefrom, including any dividends or distributions of securities which may be declared in respect of the Shares and entitled to vote in respect of the matters contemplated by Article II.

(i) “Transfer” means, with respect to a security, the sale, grant, assignment, transfer, pledge, encumbrance, hypothecation or other disposition of such security or the Beneficial Ownership thereof (including by operation of Law), or the entry into any Contract to effect any of the foregoing, including, for purposes of this Agreement, the transfer or sharing of any voting power of such security or other rights in or of such security, the granting of any proxy with respect to such security, depositing such security into a voting trust or entering into a voting agreement with respect to such security.

II. AGREEMENT TO VOTE

Section 2.1 Agreement to Vote. Subject to the terms and conditions hereof, each Stockholder irrevocably and unconditionally agrees that from and after the date hereof and until the earliest to occur of (i) the Effective Time; (ii) the termination of the Merger Agreement in accordance with its terms, and (iii) the written agreement of the Purchaser Parties to terminate this Agreement (such earliest occurrence being the “Expiration Time”), at any meeting (whether annual or special, and at each adjourned or postponed meeting) of the Company’s stockholders, however called, or in any other circumstances (including any sought action by written consent) upon which a vote or other consent or approval is sought (any such meeting or other circumstance, a “Stockholder’s Meeting”), each Stockholder will (y) appear at such a meeting or otherwise cause its Owned Shares to be counted as present thereat for purposes of calculating a quorum and respond to any other request by the Company for written consent, if any, and, unless otherwise expressly consented to in writing by the Purchaser Parties, in their sole discretion, (z) vote, or cause to be voted, all of such Stockholder’s Shares Beneficially Owned by such Stockholder as of the relevant time (“Owned Shares”) (A) in favor of the adoption of the Merger Agreement (whether or not recommended by the Company’s Board of Directors or any committee thereof) and the approval of the transactions contemplated thereby, including the Merger, (B) in favor of the approval of any other matter to be approved by the stockholders of the Company to facilitate the transactions contemplated by the Merger Agreement, including the Merger, (C) against any Alternative Proposal or any transaction contemplated by such Alternative Proposal, (D) against any proposal made in opposition to, or in competition or inconsistent with, the Merger or the Merger Agreement, including the adoption thereof or the consummation thereof, (E) against any extraordinary dividend, distribution or recapitalization by

the Company or change in the capital structure of the Company (other than pursuant to or as explicitly permitted by the Merger Agreement) and (F) against any action or agreement that would reasonably be expected to result in any condition to the consummation of the Merger set forth in Article VI of the Merger Agreement not being fulfilled.

Section 2.2 Additional Shares. Each Stockholder hereby agrees, while this Agreement is in effect, promptly to notify the Purchaser Parties of the number of any new Shares or Company Stock Options with respect to which Beneficial Ownership is acquired by such Stockholder, if any, after the date hereof and before the Expiration Time. Any such Shares shall automatically become subject to the terms of this Agreement as Owned Shares as though owned by such Stockholder as of the date hereof.

Section 2.3 Restrictions on Transfer, Etc. Except as provided for herein or as contemplated in the Equity Rollover Commitment Letter, each Stockholder agrees, from the date hereof until the Expiration Time, not to (i) directly or indirectly Transfer or offer to Transfer any Owned Shares or Company Stock Options; (ii) tender any Owned Shares or Company Stock Options into any tender or exchange offer or otherwise; or (iii) otherwise restrict the ability of such Stockholder freely to exercise all voting rights with respect thereto. Any action attempted to be taken in violation of the preceding sentence will be null and void. Notwithstanding the foregoing, each Stockholder may make transfers of Owned Shares for estate planning or similar purposes so long as such Stockholder retains control over the voting and disposition of such Owned Shares and agrees in writing to continue to vote such Owned Shares in accordance with this Agreement. Each Stockholder further agrees to authorize and hereby authorizes the Purchaser Parties and the Company to notify the Company’s transfer agent that there is a stop transfer order with respect to all of the Owned Shares and that this Agreement places limits on the voting of the Owned Shares.

Section 2.4 Proxy. Each Stockholder hereby revokes any and all previous proxies granted with respect to its Owned Shares. By entering into this Agreement, each Stockholder hereby grants a proxy appointing Parent, with full power of substitution, as such Stockholder’s attorney-in-fact and proxy, for and in such Stockholder’s name, to be counted as present and to vote or otherwise to act on behalf of the Stockholder with respect to its Owned Shares solely with respect to the matters set forth in, and in the manner contemplated by Section 2.1 as such proxy or it substitutes shall, in the Purchaser Parties’ sole discretion, deem proper with respect to its Owned Shares. The proxy granted by each Stockholder pursuant to this Section 2.4 is, subject to the penultimate sentence of this Section 2.4, irrevocable and is coupled with an interest, in accordance with Section 6502 of the General Corporation Code of the State of Kansas and is granted in order to secure such Stockholder’s performance under this Agreement and also in consideration of Parent and Merger Sub entering into this Agreement and the Merger Agreement. If any Stockholder fails for any reason to be counted as present or to vote such Stockholder’s Owned Shares in accordance with the requirements of Section 2.1 above (or anticipatorily breaches such section), then the Purchaser Parties shall have the right to cause to be present or vote such Stockholder’s Owned Shares in accordance with the provisions of Section 2.1. The proxy granted by each Stockholder shall be automatically revoked upon termination of this Agreement in accordance with its terms. Each Stockholder agrees, from the date hereof until the Expiration Time, not to attempt to revoke, frustrate the exercise of, or challenge the validity of, the irrevocable proxy granted pursuant to this Section 2.4.

III. REPRESENTATIONS AND WARRANTIES

Section 3.1 Representations and Warranties of Stockholders. The Stockholders, severally and not jointly, represent and warrant to the Purchaser Parties as of the date of this Agreement and at all times during the term of this Agreement, as follows:

(a) Each Stockholder has the requisite capacity and authority to execute and deliver this Agreement and to fulfill and perform such Stockholder’s obligations hereunder. This Agreement has been duly and validly executed and delivered by such Stockholder and constitutes a legal, valid and binding agreement of such Stockholder enforceable by the Purchaser Parties against such Stockholder in accordance with its terms.

(b) The number of Shares of Company Common Stock constituting Owned Shares of each Stockholder as of the date hereof, and the number of votes which the holder of such Shares shall be entitled to cast in respect of any matter as to which holders of Shares are entitled to cast votes, are set forth next to such Stockholder’s name on Schedule A of this Agreement. Such Stockholder is the record and Beneficial Owner and has good, valid and marketable title, free and clear of any Liens (other than those arising under this Agreement), of the Owned Shares, and, except as provided in this Agreement, has full and unrestricted power to dispose of and vote all of such Stockholder’s Owned Shares without the consent or approval of, or any other action on the part of any other Person, and has not granted any proxy inconsistent with this Agreement that is still effective or entered into any voting or similar agreement with respect to, such Stockholder’s Owned Shares. The Owned Shares set forth next to such Stockholder’s name on Schedule A hereto constitute all of the capital stock of the Company that is Beneficially Owned by such Stockholder as of the date hereof, and, except for such Stockholder’s Owned Shares and the Owned Shares owned by the other Stockholders who are parties to this Agreement, such Stockholder and such Stockholder’s Affiliates do not Beneficially Own or have any right to acquire (whether currently, upon lapse of time, following the satisfaction of any conditions, upon the occurrence of any event or any combination of the foregoing) any Shares or any securities convertible into Shares (including Company Stock Options).

(c) Other than the filing by a Stockholder of any reports with the SEC required by Sections 13(d) or 16(a) of the Exchange Act, none of the execution and delivery of this Agreement by a Stockholder, the consummation by a Stockholder of the transactions contemplated hereby or compliance by a Stockholder with any of the provisions hereof (i) requires any consent or other Permit of, or filing with or notification to, any Governmental Entity or any other Person by such Stockholder, (ii) results in a violation or breach of, or constitutes (with or without notice or lapse of time or both) a default (or gives rise to any third party right of termination, cancellation, material modification or acceleration) under any of the terms, conditions or provisions of any organizational document or Contract to which such Stockholder is a party or by which such Stockholder or any of such Stockholder’s properties or assets (including such Stockholder’s Owned Shares) may be bound, (iii) violates any Order or Law applicable to such Stockholder or any of such Stockholder’s properties or assets (including such Stockholder’s Owned Shares), or (iv) results in a Lien upon any of such Stockholder’s properties or assets (including such Stockholder’s Owned Shares).

IV. ADDITIONAL COVENANTS OF THE STOCKHOLDERS

Section 4.1 Waiver of Appraisal Rights. Each Stockholder hereby waives any rights of appraisal or rights of dissent from the Merger that such Stockholder may have.

Section 4.2 Disclosure. Each Stockholder, severally and not jointly, hereby authorizes the Purchaser Parties and the Company to publish and disclose in any announcement or disclosure required by the SEC or other Governmental Entity such Stockholder’s identity and ownership of the Owned Shares and the nature of such Stockholder’s obligation under this Agreement.

Section 4.3 Non-Interference; Further Assurances. Each Stockholder agrees that, prior to the termination of this Agreement, such Stockholder shall not take any action that would make any representation or warranty of such Stockholder contained herein untrue or incorrect or have the effect of preventing, impeding, interfering with or adversely affecting the performance by such Stockholder of its obligations under this Agreement. Each Stockholder agrees, without further consideration, to execute and deliver such additional documents and to take such further actions as necessary or reasonably requested by the Purchaser Parties to confirm and assure the rights and obligations set forth in this Agreement or to consummate the transactions contemplated by this Agreement.

Section 4.4 No Solicitation. Subject to Section 6.18, each Stockholder agrees that it shall not, and shall direct its Representatives not to, directly or indirectly, (i) initiate, solicit, knowingly encourage (including by providing information) or facilitate any inquiries, proposals or offers with respect to, or the making or completion of, an Alternative Proposal, (ii) engage or participate in any negotiations concerning, or provide or cause to be provided any non-public information or data relating to the Company, any of its Subsidiaries, any Company Joint Venture, KMP or KMR in connection with, or have any discussions with any person relating to, an actual or proposed Alternative Proposal, or otherwise knowingly encourage or facilitate any effort or attempt to make or implement an Alternative Proposal, (iii) approve, endorse or recommend, or propose publicly to approve, endorse or recommend, any Alternative Proposal, (iv) approve, endorse or recommend, or propose to approve, endorse or recommend, or execute or enter into, any letter of intent, agreement in principle, merger agreement, acquisition agreement, option agreement or other similar agreement relating to any Alternative Proposal, (v) amend, terminate, waive or fail to enforce, or grant any consent under, any confidentiality, standstill or similar agreement, or (vi) resolve to propose or agree to do any of the foregoing. Each Stockholder agrees that it shall, and shall cause each of its Representatives to, immediately cease any existing solicitations, discussions or negotiations with any Person (other than the parties hereto) that has made or indicated an intention to make an Alternative Proposal. If, prior to the Expiration Time, a Stockholder receives a proposal with respect to the sale of Shares in connection with an Alternative Proposal, then such Stockholder shall promptly (and in any event within 48 hours) advise the Purchaser Parties orally and in writing of (i) any Alternative Proposal or indication or inquiry with respect to or that would reasonably be expected to lead to any Alternative Proposal, (ii) any request for non-public information relating to the Company, its Subsidiaries, a Company Joint Venture, KMP or KMR, other than requests for information in the ordinary course of business and consistent with past practice and not reasonably expected to be related to an Alternative Proposal, and (iii) any inquiry or request for discussion or negotiation

regarding an Alternative Proposal, including in each case the identity of the person making any such Alternative Proposal or indication or inquiry and the material terms of any such Alternative Proposal or indication or inquiry (including copies of any document or correspondence evidencing such Alternative Proposal or inquiry). Subject to applicable Law, each Stockholder agrees that it shall not, and that it shall direct its Representatives not to, directly or indirectly, (i) initiate, solicit, encourage (including by providing information) or facilitate any inquiries, proposals or offers with respect to, or the making or completion of, a KMP/KMR Proposal, (ii) engage or participate in any negotiations concerning, or provide or cause to be provided any non-public information or data relating to Kinder Morgan Energy Partners, L.P. or Kinder Morgan Management, LLC in connection with, or have any discussions with any person relating to, an actual or proposed KMP/KMR Proposal, or otherwise knowingly encourage or facilitate any effort or attempt to make or implement a KMP/KMR Proposal. For the avoidance of the doubt, the fact that the Board of Directors of the Company (or any committee thereof) shall determine that an Alternative Proposal is a Superior Proposal shall in no way affect or limit the obligations of any of the Stockholders under this Agreement, including Section 2.1 and this Section 4.4.

V. TERMINATION

Section 5.1 Termination. This Agreement shall terminate without further action at the Expiration Time.

Section 5.2 Effect of Termination. Upon termination of this Agreement, the rights and obligations of all the parties will terminate and become void without further action by any party except for the provisions of Section 5.1, this Section 5.2 and Article VI, which will survive such termination. For the avoidance of doubt, the termination of this Agreement shall not relieve any party of liability for any willful breach of this Agreement prior to the time of termination.

VI. GENERAL

Section 6.1 Notices. Any notice, request, instruction or other communication under this Agreement shall be in writing and delivered by hand or overnight courier service or by facsimile, (i) if to a Stockholder, to the address set forth below such Stockholder’s name on the signature page hereto, and (ii) if to the Purchaser Parties, in accordance with Section 8.7 of the Merger Agreement, or to such other Persons, addresses or facsimile numbers as may be designated in writing by the Person entitled to receive such communication as provided above. Each such communication, if to a Stockholder, will be effective (A) if delivered by hand or overnight courier service, when such delivery is made at the address specified in this Section 6.1, or (B) if delivered by facsimile, when such facsimile is transmitted to the facsimile number specified in this Section 6.1 and appropriate confirmation is received.

Section 6.2 Parties in Interest. Other than with respect to the parties to this Agreement, nothing in this Agreement, express or implied, is intended to or shall confer upon any person any right, benefit or remedy of any nature whatsoever under or by reason of this Agreement.

Section 6.3 Governing Law. This Agreement shall be governed by, and construed in accordance with, the Laws of the State of Delaware, without giving effect to any applicable principles of conflict of laws that would cause the Laws of another state otherwise to govern this Agreement.

Section 6.4 Severability. The provisions of this Agreement are severable and the invalidity or unenforceability of any provision will not affect the validity or enforceability of the other provisions of this Agreement. If any provision of this Agreement, or the application of that provision to any Person or any circumstance, is invalid or unenforceable, (i) a suitable and equitable provision will be substituted for that provision in order to carry out, so far as may be valid and enforceable, the intent and purpose of the invalid or unenforceable provision and (ii) the remainder of this Agreement and the application of that provision to other Persons or circumstances will not be affected by such invalidity or unenforceability, nor will such invalidity or unenforceability affect the validity or enforceability of that provision, or the application of that provision, in any other jurisdiction.

Section 6.5 Assignment. Neither this Agreement nor any right, interest or obligation hereunder may be assigned by any party hereto, in whole or part (whether by operation of Law or otherwise), without the prior written consent of the other parties hereto and any attempt to do so shall be null and void; except that Merger Sub may assign, in its sole discretion, any or all of its rights, interests and obligations under this Agreement to Parent or any direct or indirect wholly-owned subsidiary of Parent.

Section 6.6 Successors and Assigns. This Agreement shall be binding upon and shall inure to the benefit of and be enforceable by the parties and their respective successors and permitted assigns, including without limitation in the case of each Stockholder, any trustee, executor, heir, legatee or personal representative succeeding to the ownership of (or power to vote) such Stockholder’s Shares or other securities subject to this Agreement (including as a result of the death, disability or incapacity of such Stockholder).

Section 6.7 Interpretation. The headings in this Agreement are for reference only and do not affect the meaning or interpretation of this Agreement. Definitions apply equally to both the singular and plural forms of the terms defined. Whenever the context may require, any pronoun includes the corresponding masculine, feminine and neuter forms. All references in this Agreement to Articles and Sections refer to Articles and Sections of this Agreement unless the context requires otherwise. The words “include,” “includes” and “including” are not limiting and will be deemed to be followed by the phrase “without limitation.” The phrases “herein,” “hereof,” “hereunder” and words of similar import shall be deemed to refer to this Agreement as a whole and not to any particular provision of this Agreement. The word “or” shall be inclusive and not exclusive unless the context requires otherwise. Unless the context requires otherwise, any agreements, documents, instruments or Laws defined or referred to in this Agreement will be deemed to mean or refer to such agreements, documents, instruments or Laws as from time to time amended, modified or supplemented, including (i) in the case of agreements, documents or instruments, by waiver or consent and (ii) in the case of Laws, by succession of comparable successor statutes. All references in this Agreement to any particular Law will be deemed to refer also to any rules and regulations promulgated under that Law. References to a Person will refer to its predecessors and successors and permitted assigns.

Section 6.8 Amendments. This Agreement may not be amended except by the express written agreement signed by all of the parties to this Agreement.

Section 6.9 Extension; Waiver. At any time prior to the Effective Time, the Purchaser Parties, on the one hand, and the Stockholders, on the other hand, may (i) extend the time for the performance of any of the obligations of the other party, (ii) waive any inaccuracies in the representations and warranties of the other party contained in this Agreement or in any document delivered under this Agreement or (iii) waive compliance with any of the covenants or conditions contained in this Agreement. Any agreement on the part of a party to any extension or waiver will be valid only if set forth in an instrument in writing signed by such party. The failure of any party to assert any of its rights under this Agreement or otherwise will not constitute a waiver of such rights.

Section 6.10 Fees and Expenses. Except as expressly provided in this Agreement, each party is responsible for its own fees and expenses (including the fees and expenses of financial consultants, investment bankers, accountants and counsel) in connection with the entry into of this Agreement and the consummation of the transactions contemplated hereby.

Section 6.11 Entire Agreement. This Agreement (together with the Equity Rollover Commitment Letter executed by each of the Stockholders and the Merger Agreement) constitutes the entire agreement and supersedes all other prior agreements, understandings, representations and warranties, both written and oral, among the parties to this Agreement with respect to the subject matter of this Agreement.

Section 6.12 Rules of Construction. The parties to this Agreement have been represented by counsel during the negotiation and execution of this Agreement and waive the application of any Laws or rule of construction providing that ambiguities in any agreement or other document will be construed against the party drafting such agreement or other document.

Section 6.13 Remedies Cumulative. Except as otherwise provided in this Agreement, any and all remedies expressly conferred upon a party to this Agreement will be cumulative with, and not exclusive of, any other remedy contained in this Agreement, at law or in equity. The exercise by a party to this Agreement of any one remedy will not preclude the exercise by it of any other remedy.

Section 6.14 Counterparts; Effectiveness; Execution. This Agreement may be executed in any number of counterparts, all of which are one and the same agreement. This Agreement will become effective and binding upon each Stockholder when executed by such Stockholder and the Purchaser Parties. This Agreement may be executed by facsimile signature by any party and such signature is deemed binding for all purposes hereof, without delivery of an original signature being thereafter required.

Section 6.15 Specific Performance. The parties to this Agreement agree that irreparable damage would occur in the event that any of the provisions of this Agreement were not performed in accordance with their specific terms or were otherwise breached. It is accordingly agreed that prior to the termination of this Agreement in accordance with Article V the parties to this Agreement will be entitled to an injunction or injunctions to prevent breaches

of this Agreement and to enforce specifically the terms and provisions of this Agreement in any court of the United States or any state having jurisdiction, this being in addition to any other remedy to which they are entitled at law or in equity.

Section 6.16 Submission to Jurisdiction. Each of the parties hereto irrevocably agrees that any Legal Action or proceeding with respect to this Agreement and the rights and obligations arising hereunder, or for recognition and enforcement of any judgment in respect of this Agreement and the rights and obligations arising hereunder brought by the other party hereto or its successors or assigns, shall be brought and determined exclusively in any federal or state court located in the State of Delaware. Each of the parties hereto hereby irrevocably submits with regard to any such action or proceeding for itself and in respect of its property, generally and unconditionally, to the personal jurisdiction of the aforesaid courts and agrees that it will not bring any action relating to this Agreement or any of the transactions contemplated hereby in any court other than the aforesaid courts. Each of the parties hereto hereby irrevocably waives, and agrees not to assert, by way of motion, as a defense, counterclaim or otherwise, in any action or proceeding with respect to this Agreement, (a) any claim that it is not personally subject to the jurisdiction of the above named courts for any reason other than the failure to serve in accordance with this Section 6.16, (b) any claim that it or its property is exempt or immune from jurisdiction of any such court or from any legal process commenced in such courts (whether through service of notice, attachment prior to judgment, attachment in aid of execution of judgment, execution of judgment or otherwise) and (c) to the fullest extent permitted by the applicable law, any claim that (i) the suit, action or proceeding in such court is brought in an inconvenient forum, (ii) the venue of such suit, action or proceeding is improper or (iii) this Agreement, or the subject mater hereof, may not be enforced in or by such courts. Each of the parties hereto agrees that mailing of process or other papers in connection with any such action or proceeding in the manner provided in Section 6.1 or in such other manner as may be permitted by applicable Laws, will be valid and sufficient service thereof.

Section 6.17 Waiver of Jury Trial. Each party acknowledges and agrees that any controversy that may arise under this Agreement is likely to involve complicated and difficult issues and, therefore, each such party irrevocably and unconditionally waives any right it may have to a trial by jury in respect of any litigation, controversy or other Legal Action directly or indirectly arising out of or relating to this Agreement or the transactions contemplated by this Agreement. Each party to this Agreement certifies and acknowledges that (i) no Representative of any other party has represented, expressly or otherwise, that such other party would not seek to enforce the foregoing waiver in the event of a Legal Action, (ii) such party has considered the implications of this waiver, (iii) such party makes this waiver voluntarily and (iv) such party has been induced to enter into this Agreement by, among other things, the mutual waivers and certifications in this Section 6.17.

Section 6.18 Action in Stockholder Capacity Only. The parties acknowledge that this Agreement is entered into by each Stockholder solely in such Stockholder’s capacity as the Beneficial Owner of such Stockholder’s Owned Shares and nothing in this Agreement restricts or limits any action taken by such Stockholder in his capacity as a director or officer of the Company, KMP or KMR or any of their respective controlled Affiliates (but not on his own behalf as a stockholder) and the taking of any actions (or failure to act) in his capacity as an

officer or director of the Company, KMP or KMR or any of their respective controlled Affiliates will not be deemed to constitute a breach of this Agreement.

Section 6.19 Additional Stockholders. Additional Stockholders shall become a party to this Agreement upon their execution of this Agreement. Any such additional Stockholders who become parties to this Agreement shall not affect the rights and obligations of any other party hereto.

[Remainder of page intentionally left blank. Signature Page Follows.]

IN WITNESS WHEREOF, each party hereto has caused this Agreement to be signed as of the date first above written.

KNIGHT HOLDCO LLC

By:	/s/ Henry Cornell
	Name: Henry Cornell
	Title: Authorized Person

KNIGHT ACQUISITION CO.

By:	/s/Henry Cornell
	Name: Henry Cornell
	Title: Authorized Person

STOCKHOLDERS:



/s/ Richard D. Kinder
Richard D. Kinder
500 Dallas St
Suite 1000
Houston, TX 77002

SCHEDULE A

BENEFICIAL OWNERSHIP OF SHARES AND COMPANY COMMON STOCK

Richard D. Kinder: 23,994,827(1) shares of Company Common Stock with one vote per share.

(1) Includes 250 shares held by Mr. Kinder for the account of his nephew.