Raymond Johnson Chapman (January 15, 1891 – August 17, 1920) was an American baseball player.
He spent his entire career as a shortstop for the Cleveland Indians.
Chapman was hit in the head by a pitch thrown by Yankees pitcher Carl Mays and died 12 hours later.
He remains the only Major League Baseball player to die from an injury received during a MLB game.
His death led Major League Baseball to establish a rule requiring umpires to replace the ball whenever it became dirty.
Chapman’s death and sanitary concerns also led to the ban on spitball after the 1920 season.
Chapman's death was one of the examples cited to justify the wear of batting helmets.
However, it took over 30 years to adopt the rule that requires their use.