Last of the Dogmen 1995

Modern bounty hunter Lewis Gates is hired to track down three dangerous fugitives who have escaped into the Montana wilderness. When the fugitives are found murdered, Gates has a mystery on his hands. Accompanied by anthropologist Lillian Sloane, Gates ventures further into the mountains and discovers an isolated settlement inhabited by a Native American tribe thought to have been wiped out by white settlers a century earlier. The two gradually begin to gain acceptance within the tribe, but when Gates' vengeful ex father-in-law, Sheriff Deegan, leads a posse into the mountains, Gates and Sloane must prevent the tribe from being massacred a second time.