Monster Inside: Robert Lopez

Robert Lopez warned women he loved never to betray him. In 2005, after serving 10 years for stabbing and nearly killing his first girlfriend, Lopez had a new girlfriend. But when she gave Lopez reason to doubt her affection, he exacted fatal revenge. Dr. Sasha Bardey identifies Lopez as a push-button killer--one who has a specific set of emotional buttons, that when pushed, unleash a murderous rage. From behind bars, in a first-time ever interview, Lopez reveals the source of the horrifying rage that left 21-year-old Brandi Bernard dead.