The Doolins of Oklahoma.

When the Daltons are killed at Coffeyville, gang member Bill Doolin, arriving late, escapes but kills a man. Now wanted for murder, he becomes the leader of the Doolin gang. He eventually leaves the gang and tries to start a new life under a new name, but the old gang members appear and his true identity becomes known. Once again he becomes an outlaw trying to escape from the law.