sentences:  The American Boys were also implicated in the murder of Toledo police officer George Zientara on April 16, 1928, who was shot dead in the aftermath of an American Express armored truck heist.Winkler himself enjoyed Capone's complete confidence, even after Fred Burke was publicly named as a suspect in the massacre and the discovery of the murder weapons.Winkler often told people that he worked as a 'contractor' which might have played on the undertone of the word and his career as a contract killer.