1951: “St. Valentine’s Day Massacre II.” Sugar Ray Robinson won the middleweight championship from “Raging Bull” Jake LaMotta on a 13th-round TKO at Chicago Stadium. LaMotta, who had never been knocked down, preserved that record.

St. Valentine’s Day Massacre” took place in a Chicago garage as seven rivals of Al Capone’s gang were gunned down. Known as the “Valentine’s Day Massacre,” this is one of the most violent events of the Chicago gang era,

On this day in Chicago history, an infamous event unfolded on North Side that's reverberated for almost a century and has become an inextricable part of the city's identity to this day.