Young woman jogger Mollie Tibbetts snatched from Iowa street, killed, dumped in cornfield

A man admits to dumping Mollie Tibbetts body in a rural Iowa cornfield after encountering her while the college student was jogging, but Chrishtian Rivera claims he doesn't remember what happened to cause her death. Nancy Grace updates the tragic case with her experts, including forensics expert Joseph Scott Morgan, private investigator Vincent Hill, Atlanta juvenile judge & lawyer Ashley Willcott, New York psychologist Caryn Stark, RadarOnline.com reporter Alexis Tereszcuk, and CrimeOnline reporter Leigh Egan.