UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                  SCHEDULE 13D

                    Under the Securities Exchange Act of 1934
                               (Amendment No. 4)*

                             Kerr-McGee Corporation
                                (Name of Issuer)

                                  Common Stock
                         (Title of Class of Securities)

                                    492386107
                                 (CUSIP Number)

                               Marc Weitzen, Esq.
                                 General Counsel
                  Icahn Associates Corp. & affiliated companies
                          767 Fifth Avenue, 47th Floor
                            New York, New York 10153
                                 (212) 702-4388

           (Name, Address and Telephone Number of Person Authorized to
                       Receive Notices and Communications)

                                 April 13, 2005
             (Date of Event which Requires Filing of this Statement)

If the filing person has previously  filed a statement on Schedule 13G to report
the  acquisition  that is the subject of this  Schedule  13D, and is filing this
schedule  because of "  240.13d-1(e),  240.13d-1(f) or  240.13d-1(g),  check the
following box / /.

NOTE:  Schedules  filed in paper format shall include a signed original and five
copies of the schedule, including all exhibits. See Rule 13d-7 for other parties
to whom copies are to be sent.

*The  remainder of this cover page shall be filled out for a reporting  person's
initial filing on this form with respect to the subject class of securities, and
for  any  subsequent   amendment   containing   information  which  would  alter
disclosures provided in a prior cover page.

The information required on the remainder of this cover page shall not be deemed
to be "filed" for the purpose of Section 18 of the  Securities  Exchange  Act of
1934 ("Act") or otherwise  subject to the liabilities of that section of the Act
but  shall be  subject  to all other  provisions  of the Act  (however,  see the
Notes).



                                  SCHEDULE 13D

CUSIP No.  492386107

1        NAME OF REPORTING PERSON
                  High River Limited Partnership

         S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

2        CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                         (a) / /
                                                                         (b) /X/
3        SEC USE ONLY

4        SOURCE OF FUNDS*
                  OO

5        CHECK BOX IF DISCLOSURE OF LEGAL  PROCEEDINGS  IS REQUIRED  PURSUANT TO
         ITEMS 2(d) or 2(e) /X/

6        CITIZENSHIP OR PLACE OF ORGANIZATION
                  Delaware

NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH:

7        SOLE VOTING POWER
                           1,648,820

8        SHARED VOTING POWER
                           0

9        SOLE DISPOSITIVE POWER
                           1,648,820

10       SHARED DISPOSITIVE POWER
                           0

11       AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
                           1,648,820

12       CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*
                  /X/

13       PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
                           1.01%

14       TYPE OF REPORTING PERSON*
                  PN



                                  SCHEDULE 13D

CUSIP No.  492386107

1        NAME OF REPORTING PERSON
                  Hopper Investments LLC

         S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

2        CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                         (a) / /
                                                                         (b) /X/
3        SEC USE ONLY

4        SOURCE OF FUNDS*
                  OO

5        CHECK BOX IF DISCLOSURE OF LEGAL  PROCEEDINGS  IS REQUIRED  PURSUANT TO
         ITEMS 2(d) or 2(e) /X/

6        CITIZENSHIP OR PLACE OF ORGANIZATION
                  Delaware

NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH:

7        SOLE VOTING POWER
                           0

8        SHARED VOTING POWER
                           1,648,820

9        SOLE DISPOSITIVE POWER
                           0

10       SHARED DISPOSITIVE POWER
                           1,648,820

11       AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
                           1,648,820

12       CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*
                  /X/

13       PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
                           1.01%

14       TYPE OF REPORTING PERSON*
                  OO



                                  SCHEDULE 13D

CUSIP No.  492386107

1        NAME OF REPORTING PERSON
                  Barberry Corp.

         S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

2        CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                         (a) / /
                                                                         (b) /X/
3        SEC USE ONLY

4        SOURCE OF FUNDS*
                  OO

5        CHECK BOX IF DISCLOSURE OF LEGAL  PROCEEDINGS  IS REQUIRED  PURSUANT TO
         ITEMS 2(d) or 2(e) /X/

6        CITIZENSHIP OR PLACE OF ORGANIZATION
                  Delaware

NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH:

7        SOLE VOTING POWER
                           0

8        SHARED VOTING POWER
                           1,648,820

9        SOLE DISPOSITIVE POWER
                           0

10       SHARED DISPOSITIVE POWER
                           1,648,820

11       AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
                           1,648,820

12       CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*
                  /X/

13       PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
                           1.01%

14       TYPE OF REPORTING PERSON*
                  CO



                                  SCHEDULE 13D

CUSIP No.  492386107

1        NAME OF REPORTING PERSON
                  Icahn Partners Master Fund L.P.

         S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

2        CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                         (a) / /
                                                                         (b) /X/
3        SEC USE ONLY

4        SOURCE OF FUNDS*
                  OO

5        CHECK BOX IF DISCLOSURE OF LEGAL  PROCEEDINGS  IS REQUIRED  PURSUANT TO
         ITEMS 2(d) or 2(e) /X/

6        CITIZENSHIP OR PLACE OF ORGANIZATION
                  Cayman Islands

NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH:

7        SOLE VOTING POWER
                           3,365,557

8        SHARED VOTING POWER
                           0

9        SOLE DISPOSITIVE POWER
                           3,365,557

10       SHARED DISPOSITIVE POWER
                           0

11       AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
                           3,365,557

12       CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*
                  /X/

13       PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
                           2.06%

14       TYPE OF REPORTING PERSON*
                  PN



                                  SCHEDULE 13D

CUSIP No.  492386107

1        NAME OF REPORTING PERSON
                  Icahn Offshore L.P.

         S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

2        CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                         (a) / /
                                                                         (b) /X/
3        SEC USE ONLY

4        SOURCE OF FUNDS*
                  OO

5        CHECK BOX IF DISCLOSURE OF LEGAL  PROCEEDINGS  IS REQUIRED  PURSUANT TO
         ITEMS 2(d) or 2(e) /X/

6        CITIZENSHIP OR PLACE OF ORGANIZATION
                  Delaware

NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH:

7        SOLE VOTING POWER
                           0

8        SHARED VOTING POWER
                           3,365,557

9        SOLE DISPOSITIVE POWER
                           0

10       SHARED DISPOSITIVE POWER
                           3,365,557

11       AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
                           3,365,557

12       CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*
                  /X/

13       PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
                           2.06%

14       TYPE OF REPORTING PERSON*
                  PN



                                  SCHEDULE 13D

CUSIP No.  492386107

1        NAME OF REPORTING PERSON
                  CCI Offshore LLC

         S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

2        CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                         (a) / /
                                                                         (b) /X/
3        SEC USE ONLY

4        SOURCE OF FUNDS*
                  OO

5        CHECK BOX IF DISCLOSURE OF LEGAL  PROCEEDINGS  IS REQUIRED  PURSUANT TO
         ITEMS 2(d) or 2(e) /X/

6        CITIZENSHIP OR PLACE OF ORGANIZATION
                  Delaware

NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH:

7        SOLE VOTING POWER
                           0

8        SHARED VOTING POWER
                           3,365,557

9        SOLE DISPOSITIVE POWER
                           0

10       SHARED DISPOSITIVE POWER
                           3,365,557

11       AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
                           3,365,557

12       CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*
                  /X/

13       PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
                           2.06%

14       TYPE OF REPORTING PERSON*
                  OO



                                  SCHEDULE 13D

CUSIP No.  492386107

1        NAME OF REPORTING PERSON
                  Icahn Partners L.P.

         S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

2        CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                         (a) / /
                                                                         (b) /X/
3        SEC USE ONLY

4        SOURCE OF FUNDS*
                  OO

5        CHECK BOX IF DISCLOSURE OF LEGAL  PROCEEDINGS  IS REQUIRED  PURSUANT TO
         ITEMS 2(d) or 2(e) /X/

6        CITIZENSHIP OR PLACE OF ORGANIZATION
                  Delaware

NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH:

7        SOLE VOTING POWER
                           3,229,723

8        SHARED VOTING POWER
                           0

9        SOLE DISPOSITIVE POWER
                           3,229,723

10       SHARED DISPOSITIVE POWER
                           0

11       AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
                           3,229,723

12       CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*
                  /X/

13       PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
                           1.98%

14       TYPE OF REPORTING PERSON*
                  PN



                                  SCHEDULE 13D

CUSIP No.  492386107

1        NAME OF REPORTING PERSON
                  Icahn Onshore L.P.

         S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

2        CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                         (a) / /
                                                                         (b) /X/
3        SEC USE ONLY

4        SOURCE OF FUNDS*
                  OO

5        CHECK BOX IF DISCLOSURE OF LEGAL  PROCEEDINGS  IS REQUIRED  PURSUANT TO
         ITEMS 2(d) or 2(e) /X/

6        CITIZENSHIP OR PLACE OF ORGANIZATION
                  Delaware

NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH:

7        SOLE VOTING POWER
                           0

8        SHARED VOTING POWER
                           3,229,723

9        SOLE DISPOSITIVE POWER
                           0

10       SHARED DISPOSITIVE POWER
                           3,229,723

11       AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
                           3,229,723

12       CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*
                  /X/

13       PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
                           1.98%

14       TYPE OF REPORTING PERSON*
                  PN



                                  SCHEDULE 13D

CUSIP No.  492386107

1        NAME OF REPORTING PERSON
                  CCI Onshore LLC

         S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

2        CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                         (a) / /
                                                                         (b) /X/
3        SEC USE ONLY

4        SOURCE OF FUNDS*
                  OO

5        CHECK BOX IF DISCLOSURE OF LEGAL  PROCEEDINGS  IS REQUIRED  PURSUANT TO
         ITEMS 2(d) or 2(e) /X/

6        CITIZENSHIP OR PLACE OF ORGANIZATION
                  Delaware

NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH:

7        SOLE VOTING POWER
                           0

8        SHARED VOTING POWER
                           3,229,723

9        SOLE DISPOSITIVE POWER
                           0

10       SHARED DISPOSITIVE POWER
                           3,229,723

11       AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
                           3,229,723

12       CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*
                  /X/

13       PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
                           1.98%

14       TYPE OF REPORTING PERSON*
                  OO



                                                    SCHEDULE 13D

CUSIP No.  492386107

1        NAME OF REPORTING PERSON
                  Carl C. Icahn

         S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

2        CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                         (a) / /
                                                                         (b) /X/
3        SEC USE ONLY

4        SOURCE OF FUNDS*
                  OO

5        CHECK BOX IF DISCLOSURE OF LEGAL  PROCEEDINGS  IS REQUIRED  PURSUANT TO
         ITEMS 2(d) or 2(e) /X/

6        CITIZENSHIP OR PLACE OF ORGANIZATION
                  United States of America

NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH:

7        SOLE VOTING POWER
                           0

8        SHARED VOTING POWER
                           8,244,100

9        SOLE DISPOSITIVE POWER
                           0

10       SHARED DISPOSITIVE POWER
                           8,244,100

11       AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
                           8,244,100

12       CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*
                  /X/

13       PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
                           5.04%

14       TYPE OF REPORTING PERSON*
                  IN



                                  SCHEDULE 13D

Item 1.  Security and Issuer

         The  Schedule 13D filed on March 3, 2005 by the  Reporting  Persons (as
defined herein),  relating to the common stock,  $1.00 par value (the "Shares"),
of Kerr-McGee Corporation,  a Delaware corporation (the "Issuer"), as amended by
Amendment No. 1 filed on March 11, 2005, Amendment No. 2 filed on March 24, 2005
and  Amendment No. 3 filed on April 4, 2005,  is hereby  further  amended as set
forth  below by this  Amendment  No.  4 to  Schedule  13D.  The  address  of the
principal  executive offices of the Issuer is Kerr-McGee  Center,  123 Robert S.
Kerr Avenue, Oklahoma City, OK 73102.

Item 3.  Source and Amount of Funds or Other Consideration

Item 3 is hereby amended and restated to read, in its entirety, as follows:

         The aggregate  purchase price of the 8,244,100 Shares purchased by High
River,  Icahn  Master  and Icahn  Partners,  collectively,  was  $597,122,098.70
(including  commissions  and,  with respect to Shares  acquired upon exercise of
options,  including  option  purchase  prices).  The source of  funding  for the
purchase  of these  Shares was the  respective  general  working  capital of the
purchasers,  and, with respect to High River, pursuant to margin accounts in the
regular course of business.

Item 4.  Purpose of Transaction

Item 4 is hereby amended to add the following:

         On April 13,  2005,  the  Reporting  Persons,  the JANA Parties and the
Issuer entered into an agreement (the  "Agreement").  A copy of the Agreement is
filed herewith as an exhibit and incorporated herein by reference.

         On April 14, 2005, the Reporting  Persons and the JANA Parties issued a
press  release  (the  "Press  Release").  A copy of the Press  Release  is filed
herewith as an exhibit and incorporated herein by reference.

CARL  C.  ICAHN,  BARRY  S.  ROSENSTEIN  AND  CERTAIN  RELATED  PARTIES  FILED A
PRELIMINARY PROXY STATEMENT WITH THE SECURITIES AND EXCHANGE COMMISSION ON APRIL
8, 2005  RELATING TO THEIR  SOLICITATION  OF PROXIES  FROM THE  STOCKHOLDERS  OF
KERR-MCGEE  CORPORATION  WITH RESPECT TO THE 2005 ANNUAL MEETING OF KERR-MCGEE'S
STOCKHOLDERS.  THE PRELIMINARY  PROXY STATEMENT  CONTAINS  DETAILED  INFORMATION
REGARDING  THE NAMES,  AFFILIATIONS  AND  INTERESTS OF PERSONS WHO MAY BE DEEMED
PARTICIPANTS IN THE SOLICITATION OF PROXIES OF KERR-MCGEE'S STOCKHOLDERS.  THESE
PARTIES INTEND TO FILE A DEFINITIVE PROXY STATEMENT AND OTHER RELEVANT DOCUMENTS
WITH THE SECURITIES  AND EXCHANGE  COMMISSION.  SECURITY  HOLDERS ARE ADVISED TO
READ THE PROXY STATEMENT AND OTHER RELEVANT  DOCUMENTS BECAUSE THEY WILL CONTAIN
IMPORTANT  INFORMATION.  THE PROXY STATEMENT AND OTHER



RELEVANT  DOCUMENTS  MAY BE  OBTAINED  WITHOUT  CHARGE FROM THE  SECURITIES  AND
EXCHANGE  COMMISSION'S WEBSITE AT  HTTP://WWW.SEC.GOV,  AND THE DEFINITIVE PROXY
STATEMENT  AND A FORM OF PROXY  WILL BE MAILED  TO  STOCKHOLDERS  OF  KERR-MCGEE
CORPORATION.

Item 5.  Interest in Securities of the Issuer

Item 5 is hereby supplemented as follows:

         (a) The  Reporting  Persons may be deemed to  beneficially  own, in the
aggregate,  8,244,100 Shares,  representing  approximately 5.04% of the Issuer's
outstanding  Shares (based upon the 163,442,818  Shares stated to be outstanding
as of March 11, 2005 by the Issuer in the Issuer's definitive proxy statement on
Schedule  14A,  filed with the  Securities  and Exchange  Commission on April 1,
2005).

         (b) High River has sole voting  power and sole  dispositive  power with
regard to  1,648,820  Shares.  Each of  Barberry,  Hopper  and Carl C. Icahn has
shared  voting  power and shared  dispositive  power with regard to such Shares.
Icahn  Master has sole voting  power and sole  dispositive  power with regard to
3,365,557  Shares.  Each of Icahn  Offshore,  CCI Offshore and Carl C. Icahn has
shared  voting  power and shared  dispositive  power with regard to such Shares.
Icahn Partners has sole voting power and sole  dispositive  power with regard to
3,229,723  Shares.  Each of Icahn  Onshore,  CCI  Onshore  and Carl C. Icahn has
shared voting power and shared dispositive power with regard to such Shares.

         The Reporting Persons may be deemed to be members of a "group" with the
JANA  Parties  within the meaning of Section  13(d)(3) of the Act. As such,  the
group may be deemed to  beneficially  own Shares owned by the Reporting  Persons
and the JANA Parties.  Upon information and belief, the JANA Parties,  as of the
close of business on April 13, 2005, may be deemed to beneficially own 4,388,700
Shares in the aggregate.  Accordingly,  the 12,632,800 Shares that may be deemed
to be beneficially owned in the aggregate by the group constitutes approximately
7.7% of the Shares  outstanding.  However,  neither  the fact of this filing nor
anything  contained  herein  shall be  deemed to be an  admission  by any of the
Reporting  Persons  that they are the  beneficial  owners of Shares owned by the
JANA Parties.

         (c) The  following  table sets forth all  transactions  with respect to
Shares  effected  since the most recent  filing on Schedule 13D by the Reporting
Persons.  All such  transactions  were effected in the open market and the table
includes commissions paid in per share prices.

                                            No. of Shares          Price
         Name                 Date            Purchased          Per Share
--------------------------------------------------------------------------------
High River                  04/06/05           12,000             75.2439
Icahn Master                04/06/05           24,480             75.2439
Icahn Partners              04/06/05           23,520             75.2439
--------------------------------------------------------------------------------

Item 6.  Contracts, Arrangements, Understandings or Relationship with Respect to
         Securities of the Issuer



Item 6 is hereby amended to add the following:

         On April 13,  2005,  the  Reporting  Persons,  the JANA Parties and the
Issuer entered into the Agreement.  A copy of the Agreement is filed herewith as
an exhibit and incorporated herein by reference.

         On April 14, 2005,  the Reporting  Persons and the JANA Parties  issued
the Press  Release.  A copy of the Press Release is filed herewith as an exhibit
and incorporated herein by reference.

Item 7.  Material to be Filed as Exhibits

Item 7 is hereby amended and restated to read, in its entirety, as follows:

1    Agreement among the Reporting Persons, the JANA Parties and the Issuer.

2    Press Release issued by the Reporting Persons and the JANA Parties.



                                    SIGNATURE

         After  reasonable  inquiry  and to the best of each of the  undersigned
knowledge and belief, each of the undersigned certifies that the information set
forth in this statement is true, complete and correct.

Dated: April 14, 2005

HOPPER INVESTMENTS LLC

         By:   Barberry Corp.

                  By: /S/ EDWARD E. MATTNER
                      -----------------------
                  Name: Edward E. Mattner
                  Title: Authorized Signatory

BARBERRY CORP.

         By: /S/ EDWARD E. MATTNER
             -----------------------
         Name: Edward E. Mattner
         Title: Authorized Signatory

HIGH RIVER LIMITED PARTNERSHIP

By:      Hopper Investments LLC, General Partner

         By:  Barberry Corp., member

         By: /S/ EDWARD E. MATTNER
             ---------------------------
             Name: Edward E. Mattner
             Title: Authorized Signatory

ICAHN PARTNERS MASTER FUND L.P.

         By: /S/ EDWARD E. MATTNER
             -----------------------
         Name: Edward E. Mattner
         Title: Authorized Signatory

       [Signature Page of Amendment #4 to Schedule 13D - Kerr-McGee, Inc.]



ICAHN OFFSHORE L.P.

         By: /S/ EDWARD E. MATTNER
             -----------------------
         Name: Edward E. Mattner
         Title: Authorized Signatory

CCI OFFSHORE LLC

         By: /S/ EDWARD E. MATTNER
             -----------------------
         Name: Edward E. Mattner
         Title: Authorized Signatory

ICAHN PARTNERS L.P.

         By: /S/ EDWARD E. MATTNER
             -----------------------
         Name: Edward E. Mattner
         Title: Authorized Signatory

ICAHN ONSHORE L.P.

         By: /S/ EDWARD E. MATTNER
             -----------------------
         Name: Edward E. Mattner
         Title: Authorized Signatory

CCI ONSHORE LLC

         By: /S/ EDWARD E. MATTNER
             -----------------------
         Name: Edward E. Mattner
         Title: Authorized Signatory

/S/ CARL C. ICAHN
-----------------------
CARL C. ICAHN

       [Signature Page of Amendment #4 to Schedule 13D - Kerr-McGee, Inc.]