Chances are that there are other murders or bodies out in the desert...you don't kill two little kids and use a sledgehammer on a human being, to say nothing of the intimacy behind slowly strangling another to death, on a sudden inexplicable impulse.

It's psychopathic.

I wonder if the police are investigating other cold cases?

Lastly, this has to be a big warning to potential employers in today's digital world, check up on your new employees' criminal records.