John Patrick McSherry was an American umpire in Major League Baseball who worked in the National League from 1971 until his death. McSherry wore uniform number 9 when he entered the National League, then wore number 10 from 1979 through the rest of his career. A respected umpire and crew chief, McSherry was officially listed at 6 feet 2 inches (1.88 m) and 328 pounds (149 kg). On April 1, 1996, the opening day of the 1996 Major League Baseball season, McSherry suffered a fatal heart attack while calling a game in Cincinnati.