The sixth and final fight between LaMotta and Robinson took place at Chicago Stadium . This fight was scheduled for 15 rounds and was for the middleweight title . Held on February 14 , 1951 , Saint Valentine 's Day , the fight became known as boxing 's version of the Saint Valentine 's Day Massacre . In the last few rounds , LaMotta began to take a horrible beating and was soon unable to defend himself from Robinson 's powerful blows . But LaMotta refused to go down . Robinson won by a technical knockout in the 13th round , when the fight was stopped with LaMotta lying on the ropes . However , Robinson was never able to knock LaMotta down
Saint Valentine 's Day Massacre
Saint Valentine's Day Massacre
Jake LaMotta