For the entirety of his Major League Baseball career, Ray Chapman was a shortstop for Cleveland. He set a team record for stolen bases that would stand for decades, but his career was tragically cut short when he was hit in the head by a pitch thrown by Yankees hurler Carl Mays. According to eyewitnesses, Chapman likely never even saw the ball. He is the only Major League Baseball player to have died as a result of an injury received in a game. His death led the league to establish what rule? Discuss