Santee (1973)

Jody Deakes joins up with his father after many years, only to discover that his dad is part of an outlaw gang on the run from a relentless bounty hunter named Santee. Jody is orphaned soon after Santee catches up to the gang, and follows Santee in hopes of taking vengeance for his father's death. Instead, however, Jody discovers that Santee is a good and loving man, tormented by the death of his young son at the hands of another outlaw gang. Santee and his wife take Jody in and a father-son relationship begins to grow. Then the gang that killed Santee's son shows up.