The Long Day of the Massacre(1968)

Original title: Il lungo giorno del massacro

When sheriff Joe Williams is unjustly accused of the murder of a young couple, which was in reality committed by the Mexican "La Muerte", Joe becomes a wanted man. Joe manages to steal and hide the loot from a bank robbery committed by the Mexican gang, but then is captured by them, but the new sheriff, Joe's friend, is on their trail.