Okay, no trial. Just put him in a cell with three hots and a cot and maybe three showers a week. No sharp objects though
Better yet, put him on trial and be found guilty of murder by reason of insanity and sentence him to life in an insane asylum with zero chance of release. Oh, wait that would never happen. What was I thinking?
Though Florence, CO, Supermax is not a mental health facility, I would think that he could stay underground in one of their cells.
This is a Federal case after all.
Let him buy all the neckties he wants from the prison commisary.