According to Michael Schiavo and George Felos (remember them?), death by starvation and dehydration is blissful, even euphoric.
Let’s switch criminals over to that method. Worked for the Nazis, the Soviets, the Communist Chinese...
Or one hour chained down in a locked, secure room with the strongest members of the victims’ families given the same weapons that he used in his victims.
If he walks out alive after an hour, a pardon is issued.