SAN FRANCISCO--(BUSINESS WIRE)--July 22, 2005--McKesson Corporation (NYSE:MCK), a leading pharmaceutical distributor and healthcare services company, announced today that Spirit Acquisition Corporation, its wholly-owned subsidiary, has commenced a cash tender offer for all of the outstanding shares of D&K Healthcare Resources, Inc. (NASDAQ:DKHR) for $14.50 net per share. McKesson and D&K announced on July 11 that the two companies had signed a definitive agreement for McKesson to acquire D&K in an all cash tender offer. D&K is a leading distributor to independent and regional pharmacies, primarily in the Midwest, Upper Midwest and the South. The company, known for its strong customer relationships and personal, hands-on service, had sales of $2.5 billion in their FY2004.