Ken Clay, who won World Series championships with the New York Yankees in 1977-78 to highlight his five-year major league career, has died at the age of 71. Dr. Jim Warner, executive medical director for the Centra Heart & Vascular Institute in Lynchburg, Virginia, notified the Yankees on Sunday that Clay died Thursday at home in Lynchburg. Warner said Clay’s cause of death was heart and kidney issues. A reliever for most of his career, Clay made his major league debut in June 1977 and appeared