The answer is prisons that we pay for, or the death penalty which we support.
I no longer support the death penalty. Not because of any moral or religious beliefs, but because I no longer trust a corrupted government, or a failed justice system infested with ignorant jurors, careerist prosecutors and politicized judges, to have the power of life and death over its citizens.
This little prick, if he doesn’t get the death penalty will not see a day of general population. If he did, he would be dead in .05 seconds. 50+ years in a 6’ x10’ box, out for 1 hour a day, 3 times a week. I’d prefer we kill him outright, but leaving him alive for his already tattered mind to fully unravel over a handful of decades is okay too.