Might he experience genuine repentance? I suppose it’s possible, but I couldn’t care less whether he does or not. He needs to die for his crimes.
If you “couldn’t care less” about what Jesus has stated heaven does, then we might have a problem here. Earth mindedness ends up losing on both earth and eternal fronts. I doubt that he will die, now. It looks too much like a sustainable mental illness defense situation, ripe for bargain anyhow by people who just want to wash the case off of the news.