Personally, I think they should give him a drug that makes him unconscious, and inflicts a great deal of pain, and then when he wakes up tell him a mistake was made on the dose and he has to do it all over again. Do that about 12 times in 12 days and then finally kill the POS. Even so it still would not be what he deserves.
Oops, I don't know where that 2 inch barrel quote came from! Please disregard it!
I recommend bad acid and beatings.