Nancy Grace talks with Dr. Bethany Marshall for an explanation of Bryan Kohberger's graduation from 'Peeping Tom' to full-blown accused mass killer. When did Bryan Kohberger first begin exhibiting signs of sexual predation? What power move was Kohberger making when he used his co-worker's fear, a product of his own making, for his own gratification? Was his fantasy world rocked when he learned Kaylee Goncalves was moving away?