Exhibit 99.1

Select Medical Corporation
4716 Old Gettysburg Road
Mechanicsburg, PA 17055

June 7, 2007

Nexus Health Systems, Inc.
Neurobehavioral Management Services, L.L.C.
Nexus Health Inc.
c/o Nexus Health Systems, Inc.
One Riverway
Suite 600
Houston, TX 77056
Attention: John Cassidy, M.D.

     Re:           Termination of Stock Purchase Agreement

Ladies and Gentlemen:

     Reference is made to the Stock Purchase Agreement, dated as of March 26, 2007 (the “Stock Purchase Agreement”), by and between Select Medical Corporation, a Delaware corporation, Nexus Health Systems, Inc., a Delaware corporation, Neurobehavioral Management Services, L.L.C., a Texas limited liability company, Nexus Health Inc., a Nevada corporation, John Cassidy, M.D. and Michelle E. Betcher.

     Pursuant to Section 10.1(a) of the Stock Purchase Agreement, the undersigned hereby terminate the Stock Purchase Agreement effective immediately, and confirm that, pursuant to Section 10.3 of the Stock Purchase Agreement, the confidentiality agreements, dated September 18, 2006 and December 5, 2006, each between Nexus Health Systems and Select Medical Corporation, shall remain in full force and effect.

     This letter shall constitute a legally binding agreement of the undersigned.

Nexus Health Systems, Inc.
Neurobehavioral Management Services, L.L.C.
Nexus Health Inc.
June 7, 2007
Page 2

NEUROBEHAVIORAL MANAGEMENT
SERVICES, L.L.C.

NEXUS HEALTH INC.

cc:		McDermott Will & Emery LLP
		28 State Street
		Boston, MA 02109-1775
		Attention: Mark B. Stein
		Dechert LLP
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		Philadelphia, PA 19104-2808
		Attention: Carmen J. Romano