Reply #1: fentanyl cocktail, with a cherry on top. He'll be gone before anaphylaxis even starts.

[sui generis]

Not that I'm in favor of capital punishment by any means. Just being practical.

I AM in favor of dropping the irretrievably and irrefutably guilty down a clean hole with a comfortable bed and loo in solitary for their remaining days, no books, TV, family visits or other human contact apart from living standards audits. Give 'em a pill to take or a button to push whenever they're ready, and leave that choice in their hands, not the state. If you want them to contemplate their mistakes - that gives them plenty of opportunity, time and focus. Also think that being in solitary for your remaining days would be a bigger deterrent to committing capital murder than death row for 20 years.