"went on to kill an innocent person. "
that's not what Dean says happened, anyway:
"We had a case where a guy who was a rapist, a serial sex offender, was convicted, then was let out on what I would think and believe was a technicality, a new trial was ordered and the victim wouldn't come back and go through the second trial. And so the guy basically got time served, and he was the man who murdered a 15-year-old girl and raped her and then left her for dead and she was dead. So life without parole doesn't work either. If life without parole worked 100 percent of the time, there'd be no need for the death penalty because I agree with the bishop. Vengeance should never be a piece of this. As human beings, we all want to get revenge. That should never part of public policy, to get revenge, but the trouble is that life without parole is not perfect either and the victims in that case are 15- and 12-year-old girls. That is every bit as heinous as putting to death someone who didn't commit the crime."
http://www.msnbc.com/news/912159.asp?cp1=1