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                                                                    EXHIBIT 10.8

                        PARTICIPANT SETTLEMENT AGREEMENT

                        SERVICE CORPORATION INTERNATIONAL
                     SUPPLEMENTAL EXECUTIVE RETIREMENT PLAN

                                __________, 2001

The terms and conditions of this offering of up to 6,000,000 shares of common
stock of Service Corporation International (the "Company" or "SCI") are set
forth in the letter from the Company dated __________, 2001 (the "Letter") and
are incorporated herein by reference. A copy of the Letter is enclosed with this
Participant Settlement Agreement. Capitalized terms used herein without
definition shall have the meanings set forth in the Letter.

THIS ELECTION FORM MUST BE RECEIVED BY THE COMPANY BY 5:00 P.M., HOUSTON, TEXAS
TIME, ON OR BEFORE _______________, _______ ____, 2001 (THE "ELECTION
DEADLINE"), UNLESS EXTENDED TO A LATER TIME BY THE COMPANY AND J.P. MORGAN
SECURITIES INC.

<Table>
<Caption>

                             NOVEMBER __, 2001
                             PRESENT VALUE OF
                              ALL RETIREMENT                              EFFECTIVE
                                 BENEFITS          *WITHHOLDING TAX     WITHHOLDING TAX
        PARTICIPANT:          DISCOUNTED 10%:         LIABILITY:            RATE:
        -----------         -----------------      -----------------    ---------------
<S>                         <C>                    <C>                  <C>

     [Participant Name]       $                      $                    $
         [Address 1]           -----------             ----------          ----------
         [Address 2]
</Table>

* The Participant's withholding tax liability shown above is calculated on the
assumption that the Participant elects to receive all of the present value of
such Participant's retirement benefits (as shown above) in shares of SCI common
stock. The Participant's actual withholding tax liability will be calculated on
the present value of the Participant's retirement benefits plus the amount of
commissions paid to J.P. Morgan Securities Inc. by the Company on the
Participant's behalf. (For the sake of convenience, the Company will contact the
Participant after the Election Deadline to make arrangements for the Participant
to satisfy the withholding tax liability associated with the amount of
commissions paid by the Company on such Participant's behalf.) If a Participant
elects to receive shares of common stock which he or she does not sell to J.P.
Morgan Securities Inc. pursuant to the election in Form 3 below, such
Participant's withholding tax liability will be based upon the fair market value
of such shares of common stock on the day they are distributed to the
Participant.

Neither the Company nor J.P. Morgan Securities Inc. shall have any liability to
the extent a Participant fails to submit a properly completed Participant
Settlement Agreement, along with any required withholding tax payment, by the
Election Deadline.

Once accepted by the Company by its execution below, an election to receive
shares of SCI common stock or to sell all or any part of such shares to J.P.
Morgan Securities Inc. as evidenced hereby is irrevocable and constitutes a
binding agreement of the Company, the Participant and J.P. Morgan Securities
Inc.

THE COMPANY RESERVES THE RIGHT TO WITHDRAW ITS OFFER HEREUNDER AT ANY TIME PRIOR
TO ITS EXECUTION OF THIS PARTICIPANT SETTLEMENT AGREEMENT.

                                       1
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================================================================================

         [ ] FORM 1 - CHECK HERE TO ELECT TO RECEIVE THE PRESENT VALUE OF ALL OR
PART OF YOUR RETIREMENT BENEFITS IN SHARES OF COMMON STOCK. The Participant
hereby irrevocably elects to receive in SCI common stock, on the terms and
subject to the conditions specified in the Letter, receipt of which is hereby
acknowledged, $___________ of the present value (calculated using a 10% annual
discount rate) of such Participant's vested retirement benefits, up to the
amount set forth in the table on the preceding page. The Participant
acknowledges that the actual number of shares of SCI common stock to be received
will be calculated by dividing the present value retirement benefit amount which
the Participant has elected to receive above by the average closing price per
share of the Company's common stock on the New York Stock Exchange for the five
trading days immediately after the Election Deadline (the "Distribution
Price"). The Participant further acknowledges that the present value retirement
benefit amount which the Participant has elected to receive above will be
rounded down to the nearest amount which will not require the Company to issue
fractional shares of its common stock.

         The Participant acknowledges that making this election requires the
Participant to (i) open an account with J.P. Morgan Securities Inc. or (ii) to
maintain a pre-existing account at J.P. Morgan Securities Inc., and to provide
such account number to the Company in writing in the space below, in each case
for the deposit of shares of common stock to be received by the Participant
from the Company. The Participant also acknowledges that the Company will
deliver such shares of common stock electronically to J.P. Morgan Securities
Inc. on behalf of the Participant to be placed in the Participant's account. If
the Participant already maintains an account at J.P. Morgan Securities Inc. and
would like such shares deposited into that account, the account number is
______________________.

         Please note that electing to receive shares of common stock requires a
determination of the method of payment of withholding tax liability in Form 2.

                                                       -------------------------
                                                       Participant's Signature

================================================================================

                                       2
<PAGE>

================================================================================

         FORM 2 - CHECK ONE OF THE FOLLOWING THREE BOXES TO INDICATE HOW YOU
WISH TO PAY FOR THE WITHHOLDING TAX LIABILITY ASSOCIATED WITH YOUR ELECTION IN
FORM 1.

         METHOD OF PAYMENT FOR WITHHOLDING TAX LIABILITY (check and complete
         appropriate box(es)):

               [ ]      CERTIFIED CHECK OR CASHIER'S CHECK IN THE AMOUNT OF
                        $________ PAYABLE TO SERVICE CORPORATION INTERNATIONAL.
                        (SCI MUST RECEIVE ANY SUCH CERTIFIED CHECK OR CASHIER'S
                        CHECK PRIOR TO THE ELECTION DEADLINE).

               [ ]      WIRE TRANSFER IN THE AMOUNT OF $________ DIRECTED TO
                        SERVICE CORPORATION INTERNATIONAL, THE CHASE MANHATTAN
                        BANK, HOUSTON, TEXAS, ABA #1130-0060-9, CREDIT: SCI
                        MANAGEMENT LP, ACCOUNT #0010-126-6337. (SCI MUST
                        RECEIVE ANY SUCH WIRE TRANSFER PRIOR TO THE ELECTION
                        DEADLINE).

               [ ]      PURSUANT TO THE ELECTION IN FORM 3, AUTHORIZE J.P.
                        MORGAN SECURITIES INC. TO DELIVER DIRECTLY TO THE
                        COMPANY PROCEEDS FROM THE SALE OF SHARES OF COMMON STOCK
                        EQUAL TO THE WITHHOLDING TAX LIABILITY IN THE AMOUNT OF
                        $____________.

                                                         -----------------------
                                                         Participant's Signature

================================================================================

                                       3
<PAGE>

================================================================================

         [ ] FORM 3 - CHECK HERE TO ELECT TO SELL ALL OR ANY PART OF THE SHARES
OF COMMON STOCK TO BE RECEIVED PURSUANT TO THE ELECTION IN FORM 1 TO J.P. MORGAN
SECURITIES INC. For value received, the Participant hereby irrevocably elects to
sell to J.P. Morgan Securities Inc. on the Closing Date $_________ in value of
the shares (such amounts to be rounded down to avoid fractional shares) of
common stock (the "Shares") received pursuant to the election in Form 1, with
payment for the Shares to be made on the third full business day following the
Closing Date. Please note that if you intend to sell shares of common stock to
J.P. Morgan Securities Inc. to satisfy the withholding tax liabilities
associated with your election in Form 1, you must so indicate in Form 2.

         The Participant acknowledges and agrees that the Shares may be sold by
J.P. Morgan Securities Inc. to the market at prices higher or lower than the
Distribution Price, and that, pursuant to this Participant Settlement Agreement,
the Participant shall only be entitled to receive from J.P. Morgan Securities
Inc. the Distribution Price for each Share sold less any proceeds paid to SCI
directly to satisfy the Participant's withholding tax liability to the extent so
elected on Form 2.

         In connection with the Participant's election to sell shares of common
stock to J.P. Morgan Securities Inc., as set forth above, the Participant hereby
makes to J.P. Morgan Securities Inc. and SCI the representations and warranties
set forth in Schedule A attached hereto, each of which is hereby incorporated
herein by reference.

                                                         -----------------------
                                                         Participant's Signature

================================================================================

                                       4
<PAGE>

                                    IMPORTANT
                             PARTICIPANT SIGNS HERE:

The Participant hereby releases and forever discharges SCI and all of its
officers, directors, employees, representatives, agents, attorneys, accountants,
successors and affiliates (collectively, the "SCI Parties") from all causes of
action, suits, debts, accounts, agreements, damages, claims and demands
whatsoever in law or in equity (collectively, the "Claims") which the
Participant ever had, now has, or hereafter can, shall or may have against the
SCI Parties arising under or in connection with or relating to the Supplemental
Executive Retirement Plan (and any obligations related thereto) that occurred or
accrued prior to the date hereof; provided, however, that nothing herein shall
release SCI from any Claims by the Participant arising out of (1) SCI's
remaining obligation to make annual cash payments to the Participant if the
Participant has elected to receive a distribution of SCI common stock equal to
the present value of less than all of such Participant's vested retirement
benefits or (2) the covenants and agreements of SCI as set forth herein or in
the Letter.

                                    PARTICIPANT

                                             By:
                                                ----------------------------
                                             Date:              , 2001
                                                  --------------
                                             Address:
                                                    ------------------------

                                             Phone:
                                                   -------------------------
                                             E-mail:
                                                    ------------------------

                                             *Must be signed by the Participant
                                             exactly as name appears on the
                                             front of this Settlement Agreement.

         By its execution below, each of the Company and J.P. Morgan Securities
Inc. hereby accepts and acknowledges the Participant's elections as described
above.

                                    SERVICE CORPORATION INTERNATIONAL

                                             By:
                                                ----------------------------
                                                 James M. Shelger
                                                 Senior Vice President,
                                                 General Counsel
                                                 and Secretary

                                    J.P. MORGAN SECURITIES INC.

                                             By:
                                                ----------------------------
                                                 Perry Bartol
                                                 Managing Director

                                       5
<PAGE>

                                   SCHEDULE A

The Participant represents and warrants to J.P. Morgan Securities Inc. and SCI
that:

                  (a) all consents, approvals, authorizations and orders
necessary for the execution and delivery by such Participant of the Agreement to
which this Schedule A is attached (the "Agreement") and for the sale and
delivery of the Shares to be sold by such Participant under the Agreement, have
been obtained; and such Participant has full right, power and authority to enter
into the Agreement and to sell, assign, transfer and deliver the Shares to be
sold by such Participant thereunder; the Agreement has been duly authorized,
executed and delivered by such Participant;

                  (b) the sale of the Shares to be sold by such Participant
under the Agreement and the compliance by such Participant with all of the
provisions of the Agreement and the consummation of the transactions herein and
therein contemplated will not conflict with or result in a breach or violation
of any of the terms or provisions of, or constitute a default under, any
statute, any indenture, mortgage, deed of trust, loan agreement or other
agreement or instrument to which such Participant is a party or by which such
Participant is bound or to which any of the property or assets of such
Participant is subject, nor will such action result in any violation of any
statute or any order, rule or regulation of any court or governmental agency or
body having jurisdiction over such Participant or the property of such
Participant; and

                  (c) such Participant has good and valid title to the Shares to
be sold at the Closing Date by such Participant under the Agreement, free and
clear of all liens, encumbrances, equities or adverse claims; such Participant
will have, immediately prior to the Closing Date good and valid title to the
Shares to be sold at the Closing Date by such Participant, free and clear of all
liens, encumbrances, equities or adverse claims; and, upon delivery of the
certificates representing such Shares and payment therefor pursuant to the
agreement, good and valid title to such Shares, free and clear of all liens,
encumbrances, equities or adverse claims, will pass to J.P. Morgan Securities
Inc.<PAGE>
                                                                   EXHIBIT 4.1.1

                          SIXTH SUPPLEMENTAL INDENTURE
              TO INDENTURE DATED MARCH 15, 1997 (7 7/8% SECURITIES)

               SIXTH SUPPLEMENTAL INDENTURE dated as of December 31, 1999, among
CHESAPEAKE ENERGY CORPORATION, an Oklahoma corporation (the "Company"), the
SUBSIDIARY GUARANTORS listed as signatories hereto, and UNITED STATES TRUST
COMPANY OF NEW YORK, a New York corporation, as Trustee to the Indenture (the
"Trustee").

               WHEREAS, Chesapeake Mid-Continent Corp., an Oklahoma corporation
("CMCC"), is a Restricted Subsidiary of the Company and a Subsidiary Guarantor
under the Indenture, and CMCC has directly merged with and into Chesapeake
Exploration Limited Partnership, an Oklahoma limited partnership ("CELP"), and
CELP is the surviving entity, a Restricted Subsidiary of the Company and a
Subsidiary Guarantor under the Indenture;

               WHEREAS, Section 10.2(a) of the Indenture provides, among other
things, that no Subsidiary Guarantor may consolidate or merge with or into
another corporation, entity or Person unless (i) the entity or Person formed by
or surviving such consolidation or merger (if other than such Subsidiary
Guarantor) assumes all the obligations of such Subsidiary Guarantor pursuant to
a supplemental indenture, in a form reasonably satisfactory to the Trustee,
under the Securities and the Indenture and (ii) immediately after such
transaction, no Default or Event of Default exists;

               WHEREAS, no Default or Event of Default exists immediately after
the merger of CMCC into CELP;

               WHEREAS, the form and substance of this Sixth Supplemental
Indenture are satisfactory to the Trustee;

               WHEREAS, contemporaneously herewith, there are being delivered to
the Trustee executed opinions of counsel and officers' certificate's proper in
form and substance;

               WHEREAS, Section 9.1 of the Indenture provides, among other
things, that the Trustee, the Subsidiary Guarantors and the Company may amend or
supplement the Indenture without notice to or consent of any Holder to reflect
the addition or release of any Subsidiary Guarantor, as provided for by the
Indenture; and

               WHEREAS, the execution and delivery of this Sixth Supplemental
Indenture have been duly authorized by the Company and the Subsidiary Guarantors
and all actions necessary to make this Sixth Supplemental Indenture a valid and
binding instrument according to its terms and the terms of the Original
Indenture have been performed.

               NOW, THEREFORE, BY THIS SIXTH SUPPLEMENTAL INDENTURE, for and in
consideration of the premises and of the mutual covenants herein contained and
for other

<PAGE>

valuable considerations, the receipt whereof is hereby acknowledged, the Company
and the Subsidiary Guarantors covenant and agree with the Trustee, for the equal
benefit of all present and future Holders of the Securities, as follows:

                                    ARTICLE I

                                   DEFINITIONS

               SECTION 1.1 The definitions set forth in or incorporated by
reference in Article I of the Indenture shall be applicable to this Sixth
Supplemental Indenture, as fully and to the same extent as if set forth herein,
except as otherwise expressly provided herein. As used in this Sixth
Supplemental Indenture, the following terms shall have the following meanings:

               "Indenture" means the Original Indenture, as amended by this
Sixth Supplemental Indenture, relating to the Securities.

               "Original Indenture" means the Indenture dated as of March 15,
1997, among the Company, the Subsidiary Guarantors listed as signatories thereto
and the Trustee, relating to the Securities, as amended by: (i) that certain
First Supplemental Indenture dated as of December 17, 1997, (ii) that certain
Second Supplemental Indenture dated as of February 16, 1998, (iii) that certain
Third Supplemental Indenture dated as of April 22, 1998, (iv) that certain
Fourth Supplemental Indenture dated as of July 1, 1998, and (v) that certain
Fifth Supplemental Indenture dated as of November 19, 1999.

                                   ARTICLE II

                         RELEASE OF SUBSIDIARY GUARANTOR

               SECTION 2.1 As a result of the direct merger with CELP, which
constitutes a merger with a Subsidiary Guarantor under Section 10.2(a) of the
Indenture, CMCC shall for all purposes be released as a Subsidiary Guarantor
from all of its Guarantee and related obligations in the Indenture, pursuant to
Section 10.4(b) of the Indenture.

               SECTION 2.2 The notation on the Securities relating to the
Guarantee shall be deemed to exclude the name of CMCC and the signature of an
Officer on behalf of CMCC.

                                   ARTICLE III

                            ASSUMPTION OF OBLIGATIONS

               SECTION 3.1 As the surviving entity in its merger with CMCC and
as a Subsidiary Guarantor, CELP hereby agrees to assume all the obligations of
CMCC.

                                        2

<PAGE>

                                   ARTICLE IV

                                  MISCELLANEOUS

               SECTION 4.1 This Sixth Supplemental Indenture is a supplemental
indenture pursuant to Section 9.1 of the Indenture. Upon execution and delivery
of this Sixth Supplemental Indenture, the terms and conditions of this Sixth
Supplemental Indenture will be part of the terms and conditions of the Indenture
for any and all purposes, and all the terms and conditions of both shall be read
together as though they constitute one instrument, except that in case of
conflict, the provisions of this Sixth Supplemental Indenture will control.

               SECTION 4.2 Except as they have been modified in this Sixth
Supplemental Indenture, each and every term and provision of the Indenture shall
remain in full force and effect.

               SECTION 4.3 This Sixth Supplemental Indenture may be executed in
any number of counterparts, each of which when so executed and delivered shall
be an original, but such counterparts shall together constitute but one and the
same instrument.

               SECTION 4.4 This Sixth Supplemental Indenture shall be governed
by and construed in accordance with the laws of the State of New York without
giving effect to applicable principals of conflicts of law to the extent that
the application of the law of another jurisdiction would be required thereby.

                                   SIGNATURES

               IN WITNESS WHEREOF, the parties hereto have caused this Sixth
Supplemental Indenture to be duly executed as of the date first written above.

                                 CHESAPEAKE ENERGY CORPORATION, an
                                 Oklahoma corporation

                                 By  /s/ AUBREY K. MCCLENDON
                                   --------------------------------------------
                                   Aubrey K. McClendon, Chief Executive Officer

                                 UNITED STATES TRUST COMPANY OF NEW
                                 YORK, a New York corporation, as Trustee

                                 By /s/ LOUIS P. YOUNG
                                   --------------------------------------------
                                   Name: Louis P. Young
                                        ---------------------------------------
                                   Title: Authorized Signer
                                         --------------------------------------

                                        3

<PAGE>

                                 SUBSIDIARY GUARANTORS

                                 CHESAPEAKE OPERATING, INC., an Oklahoma
                                 corporation

                                 By  /s/ AUBREY K. MCCLENDON
                                   --------------------------------------------
                                   Aubrey K. McClendon, Chief Executive Officer

                                 CHESAPEAKE PANHANDLE LIMITED
                                 PARTNERSHIP, an Oklahoma limited partnership

                                 By  Chesapeake Operating, Inc., an Oklahoma
                                     corporation, Sole General Partner

                                     By  /s/ AUBREY K. MCCLENDON
                                       ----------------------------------------
                                         Aubrey K. McClendon,
                                         Chief Executive Officer

                                 CHESAPEAKE ACQUISITION CORPORATION,
                                 an Oklahoma corporation

                                 By    /s/ AUBREY K. MCCLENDON
                                   --------------------------------------------
                                       Aubrey K. McClendon, President

                                 CHESAPEAKE ROYALTY COMPANY, an
                                 Oklahoma corporation

                                 By  /s/ AUBREY K. MCCLENDON
                                   --------------------------------------------
                                   Aubrey K. McClendon, Chief Executive Officer

                                        4

<PAGE>

                                 CHESAPEAKE EXPLORATION LIMITED
                                 PARTNERSHIP, an Oklahoma limited partnership

                                 By  Chesapeake Operating, Inc., an Oklahoma
                                     corporation, Sole General Partner

                                     By  /s/ AUBREY K. MCCLENDON
                                       ----------------------------------------
                                       Aubrey K. McClendon, President

                                 CHESAPEAKE ENERGY LOUISIANA
                                 CORPORATION, an Oklahoma corporation

                                 By /s/ AUBREY K. MCCLENDON
                                   --------------------------------------------
                                   Aubrey K. McClendon, Chief Executive Officer

                                 CHESAPEAKE CANADA CORPORATION, an
                                 Alberta, Canada corporation

                                 By /s/ AUBREY K. MCCLENDON
                                   --------------------------------------------
                                   Aubrey K. McClendon, Chief Executive Officer

                                 CHESAPEAKE LOUISIANA, L.P., an Oklahoma
                                 limited partnership

                                 By Chesapeake Operating, Inc., an Oklahoma
                                    corporation, Sole General Partner

                                    By  /s/ AUBREY K. MCCLENDON
                                      -----------------------------------------
                                      Aubrey K. McClendon,
                                      Chief Executive Officer

                                   THE AMES COMPANY, INC., an Oklahoma
                                   corporation

                                 By  /s/ AUBREY K. MCCLENDON
                                   --------------------------------------------
                                   Aubrey K. McClendon, Chief Executive Officer

                                        5

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