Ridin' Thunder.

When Bill Croft, a notorious gunfighter, is bushwhacked, innocent rancher Frank Douglas is accused of the crime on circumstantial evidence and sentenced to be hanged. Jack Douglas, Frank's son, sets out to prove his father's innocence with the help of Jean, the murdered man's daughter; Jack eventually apprehends the killer and forces him to confess, but the sheriff is unable to stop the execution without an official pardon.