For Them That Trespass (1949)
“Cristy” Drew, an aspiring young writer, trying to broaden his experience, gets involved with “Frankie” Ketchen and her two suitors, Herb Logan and Jim Heal. One night, Jim finds “Frankie” has been with “Cristy” and kills her. Herb is accused of the murder and sentenced to prison. When he gets out, he blames “Christy,” but finally proves Jim to be the real killer, based on a clue provided to him by “Christy,” now a famous writer.