Al Capone in Chicago By vornsoli16 May 11, 1920 Capone is credited with the assasination of boss Big Jim Colosimo May 8, 1924 Capone is responsible for the death of gangster Joe Howard Nov 10, 1924 Torrio and Capone Kill gang leader Dion O'Bannion Apr 27, 1926 Prosecuter Billy McSwiggin is Gunned Down The prosectutor was gunned down by men from Capone's gang outside a bar and McSwiggin later attempted to charge capone with murder Feb 14, 1929 St. Vaeltines Day Massace