The cost is much greater to put someone to death as it is to incarcerate for life. The appeals process is expensive.While I dislike the monetary cost of keeping someone in prison for a life sentence, it makes the most sense to me. Let him wallow in the prison violence and depravity. I'm not against the DP, but a life sentence, IMO, is much worse.
http://deathpenalty.org/facts/5-myths-death-penalty/