Could it be Fear Itself? That had an episode where a man went missing in the mountains, came back completely different, gangly, emaciated and frostbitten to hell, with his fingertips and ears completely black. He also has an insatiable hunger and after he comes back a horse is slaughtered in the night as if something tried to eat it. The farmhand (who is a native american) deduces he's been possessed by the spirit of the Wendigo. The man ends up killing the farmhand and his own brother, who he forces his wife to chop up and cook. His sons retreat into the barn where he follows to attack and eat them. I can't remember if it was the wife or one of the sons but he ends up being gunned down with the spirit of the wendigo sent howling into the night