He had plenty of time to drive home and pour a gallon of gasoline all over himself and then hit the lighter.
Or
If he was a forward thinker he could have had the gas in the trunk of his car. There are plenty of ways to kill yourself if you really want too. He had, I think, 2 1/2 hours to do it.
He won’t last long in prison unless the charge is Federal and he ends up in a supermax sitting in his cell for 23 1/2 hours a day awaiting the needle.
He was apprehended, without a fight, 250 miles or so away.
I’m sure there were plent of nice trees and bridge abutments along the way that he could have kamikazied into at 120mph. Slightly messier than putting a bullet into your head, but just as if not more effective.
He’ll do ok in genpop. Prisons have pretty decent representation by members of the Aryan Brotherhood and other white supremicist terrorist orgs. They’ll see him as a hero and will protect him.