The Fighting Sheriff (1931)

"Two-Gun Men flee when BUCK thunders down their trail!"

A dying Jack makes Bob and Flash promise not to tell his sister that he was an outlaw. When Bob confronts Flash with his muffler found at the stage holdup, Flash tells Mary that Bob killed her brother. Believing he can now marry Mary, he plans one more robbery. But the jealous Tiana overhears and runs for the Sheriff.