I would say this:
Do away with an automatic death penalty. But for folks who have committed the most heinous of crimes such that they get hundreds of years of prison sentences to run consecutively, give them the option to voluntarily end it all.
Let the volunteers have a nice dinner, a visit with a loved one, and maybe a generally pleasant day, to be followed by a strong sleeping pill. Then, while they are asleep, give them something permanent. Reserve this only for criminals who will NEVER see the light of day or smell freedom because of their crimes. And if they want to spend the rest of their lives in small, cramped cages, that's OK too.