Halloran learns that a body recovered from the East River, that of small-time burglar Peter Backalis, died within hours of the Dexter murder, and believes the two incidents are connected. Muldoon, although skeptical, lets him pursue the lead and assigns two veteran detectives on the squad to help Halloran with the legwork. Through further methodical but tedious investigation, Halloran discovers that Backalis's accomplice on a jewelry store burglary was Willie Garzah, a former wrestler with a penchant for playing the harmonica. While Halloran and his team canvass the Lower East Side of New York using an old publicity photograph of Garzah, Muldoon compels Niles to identify Jean's mystery boyfriend. He reveals that Dr. Stoneman is "Henderson". At Stoneman's office, Muldoon uses Niles to trap the married, respectable physician into confessing that he fell in love with Jean, only to learn that she and Niles were using him in order to rob his society friends. Niles then confesses that Garzah killed Jean and Backalis. Halloran and Muldoon, using different approaches, have come up with the same killer.