The Daring Caballero (1949)

Cisco learns from the Padre that Pappy Del Rio, the town's leading citizen, is to be hung the next day for murder and robbery. The Padre thinks he is innocent so Cisco breaks him out and hides him. Cisco then runs into the Mayor, an outlaw he knows who is now using a different name. Cisco figures he is the murderer and sets out to prove it.