Killburger is toast hang the sob
He might be enjoying all this, and may want to represent himself at trial like the demon that mowed down those people in the parade.
He might not even care if he’s convicted...maybe already thinking about escaping like Ted Bundy, and then killing more people.
He’s a psychopath and needs to be securely locked up forever or executed.
Unfortunately lethal injection is the only approved method in Idaho, and the state has had great problems in securing the relevant drugs.
Give the person a choice between firing squad, the chair, or hanging—or if they prefer, rule out the method that they least like and draw lots between those that remain.