I don't know why they bother to call 20 years of non-parole a life sentence. He will be out when he is less than 45 years old (depending how much time he has served already). And by then he will be well and truly institutionalised. Will likely have adopted any further (lack of) moral compass from his fellow murderous prison pals. Can still have children, can still have at least 40 years of life ahead of him. While Sam has none.