I recall a judicial sentence handed down perhaps in the 1700s or 1800s for a man to be put to death for some heinous crime. The judge provided the criminal a short amount of time to get his spiritual house in order and the opportunity to obtain biblical counseling, after which time he would be dispatched to his eternal destination. I don't think the timespan was anywhere near 20 to 30 years, but perhaps 24 to 48 hours. (I'm guessing).
This sounds to me like a humane remedy for the South Carolina killer.