1741 Died several weeks after losing the bare-knuckle championship of England to Jack Broughton, the man who later drew up the sport's first rules.
1933 Died four days after a 13th-round knockout by heavyweight champ Primo Carnera.
1947 Died 17 hours after fighting Sugar Ray Robinson for the welterweight title. Asked whether he knew Doyle was in trouble during the fight, Robinson said, "They pay me to get them in trouble."
Benny (Kid) Paret
1962 Died 10 days after losing his welterweight title to Emile Griffith in a 12th-round knockout at Madison Square Garden.
Duk Koo Kim
1982 His death after a fight with WBA lightweight champ Ray Mancini led to the shortening of title bouts from 15 to 12 rounds.