Death is too good for him.
You think being in prison with good food, heat in winter and A/C in summer, good health care, people to talk to, etc. is worst than burning in hell? I think death would do him just fine.
but the point is he is not walking free. There are bars and walls. No, let him suffer not having the freedom that we have. Then when he dies he will go to another jail that will have no air conditiioning or those other thngs you mentioned. Slow and low...that’s what he deserves.