You older guys will remember Idaho's would be mountain man Claude Dallas. He did exactly this same thing and ended up doing 20 years. He had a run in with 2 game wardens and in the ensuing shoot out, he put them both down. He made his mistake by then shooting both in the head. If he hadn't done that, he had a good chance of being acquitted for self defense. However, he turned it into 2d degree murder.
