He was machine-gunned to death on St. Valentine's Day--Feb. 14, 1929--at 2122 N. Clark
St. in Chicago, IL, along with
Frank Clark,
Pete Guesenberg (his brother),
Adam Heyer,
John May,
Reinhardt Schwimmer and [Al Weinshank]. This infamous gangland execution became known as the "St. Valentine's Day Massacre".
Al Capone sent a squad of his killers to that address to kill rival gangster Bugs Moran
George Moran--the place was a front for one of Moran's businesses--who was supposed to have been there, but he was late and didn't show up.