Ride Clear Of Diablo (1954)

Railroad surveyer Clay O'Mara goes after rustlers who murdered his father and brother. Along the way, he first arrests then teams up with outlaw Whitey Kincade, who helps Clay, only to see how long the tenderfoot lasts. Outwitting several attempts on his life engineered by the crooked lawyer who set up his family, O'Mara and a wounded Kincade face the gang. Kincade wanted to protect O'Mara and redeem himself, and goes down shooting.

IMDb: https://www.imdb.com/title/tt0047411