"I did it," Coleman said through sobs. "I did it. I don't want to say that word but I did it. I killed my girl."
Maine man gets life in prison for killing girlfriend, 2 kids →
Prosecutors say Coleman not only confessed, but told others he would have no problem killing his whole family just days before they were killed Garland in December 2014.
Lawyer: Someone else was responsible for triple killing →