Stranger stabs professor mom to death while she bathes her children

When Georgia college professor Emily Mason was stabbed to death in her home while bathing her young children, investigators first suspected her husband as the killer. Nancy Grace explores the investigation, which eventually led to a stranger. Her panel includes psychologist Caryn Stark, forensics expert Karen Smith, Atlanta juvenile judge and lawyer Ashley Willcott, WTOC-TV Reporter Dal Cannady, Crime Stories reporter Robyn Walensky.