. >> but police soon found the cold case of john henkel shot in 2003 at park avenue and 114th street. while, you know, after i told them what happened, you know, he said -- i wanted to let you know that the guy died. >> suddenly, you're charged in a murder. did you start to have second thoughts? >> no. >> trevell coleman had charged himself with murder. >> you have to concede that that man probably lived in a jail in his head for 18 years. >> editor-in-chief of "gq" magazine he was the jury foreman. >> he didn't need to come forward but did. he needed to come forward for his conscience. but we were wrestling with it as jurors because this man has gone through hell. and he's done something noble. >> but he did kill someone. >> i completely understand that for the people who knew john henkel it's a different story. >> the jury found coleman guilty of second degree murder. on may 8, 2012, he was sentenced to 15 years to life in prison. >> the case of trevell coleman has haunted me. >> when your twin sons said shortly after you were arrested, he said i'll take money from someone and if i