Cheating an Murder?? What are the Penalities..> Debate over movie with Fiance' lol?

My fiance and I are watching the movie "unfaithful". Now in the movie the guy kills his wife’s lover; CAN he go to jail or get the death penalty? Could it be considered temporary insanity? I was looking at cases where the lover kills the wife or husband and they get the death penalty and life in prision but what about the other way around? If you spouse was cheating on you and you killed your wife or the guy out of anger would you go to jail? What if you killed them when you caught them in the act? This movie sparked out interest because the police come after the lover is killed and he doesn’t get caught? We want to know what would happen if they did get caught killing the lover?

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