Bill Masterton

William John Masterton was a Canadian–American professional ice hockey player who was a centre in the National Hockey League (NHL) for the Minnesota North Stars in 1967–68. He is the only player in NHL history to die as a direct result of injuries suffered during a game. He died following a hit during a January 13, 1968, contest against the Oakland Seals. Years later, an analysis by The Toronto Star found his brain was already severely damaged from an earlier untreated concussion, and that the January 1968 hit triggered massive head trauma that ultimately killed him.