Exhibit 99.1



     Kerr-McGee Schedules Interim Second-Quarter Conference Call and Webcast
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     OKLAHOMA  CITY (May 21, 2001) - Kerr-McGee  Corp.  (NYSE:  KMG) will hold a
conference   call  at  11  a.m.  ET,  May  30,  2001,  to  discuss  its  interim
second-quarter operating results and expectations for the future.
     Interested  parties  may  listen to the call via  Kerr-McGee's  website  at
www.kerr-mcgee.com  or by  calling  212-896-6011.  A replay  of the call will be
available for 48 hours at  800-633-8284,  #18870159  within the United States or
858-812-6440,  #18870159,  outside the United States. The webcast replay will be
temporarily archived on the company's website.
     Kerr-McGee is an Oklahoma  City-based energy and inorganic chemical company
with worldwide operations and assets of $7.9 billion.

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CONTACT: Debbie Schramm
         (405) 270-2877