IMO, there’s only one punishment that fits the crime of murder.
Give the person an hour with a pastor or priest if they want to make their peace with God and then send him on his way to the meeting.
Justice delayed is justice denied. If there is DNA evidence, dispatch them immediately. Let God decide if he or she can be rehabilitated. I agree with the death penalty for drug dealers because the not only murder people, they destroy the souls of people as well.