Exhibit 3 JOINT FILING AGREEMENT This will confirm the agreement by and between the undersigned that the Statement on Schedule 13D (the "Statement") filed on or about this date relating to the offer by Spirit Acquisition Corporation, a Delaware...Joint Filing Agreement • July 22nd, 2005 • McKesson Corp • Wholesale-drugs, proprietaries & druggists' sundries
This will confirm the agreement by and between the undersigned that the Statement on Schedule 13D (the "Statement") filed on or about this date relating to the offer by Spirit Acquisition Corporation, a Delaware corporation and a wholly-owned subsidiary of McKesson Corporation, a Delaware corporation, to purchase all the outstanding shares of common stock, par value $0.01 per share, of D & K Healthcare Resources, Inc., a Delaware corporation, is being filed on behalf of the undersigned.
