Teen best friends, Abby Williams and Libby German killed while out walking trails in broad daylight in Delphi, Indiana. One of the girls snaps a cell phone photo of the suspect, who has never been caught. Four years later, the families are still searching for answers in this mystery which gripped the nation. Now, is there there a new suspect, related to another vicious crime against a 9-year-old girl? Joining Nancy Grace today: Becky Patty - Libby's Grandmother abbyandlibbytip@cacoshrf.com  Ashley Willcott - Judge and Trial Attorney, Anchor on Court TV, www.ashleywillcott.com Caryn Stark - NYC Psychologist, www.carynstark.com Sheryl McCollum - Forensic Expert & Cold Case Investigative Research Institute Founder, ColdCaseCrimes.org  Joe Scott Morgan - Professor of Forensics, Jacksonville State University, Author, "Blood Beneath My Feet" featured on "Poisonous Liaisons" on True Crime Network Alexis Tereszcuk - CrimeOnline.com Investigative Reporter, Writer/Fact Checker, Lead Stories dot Com, Twitter: @swimmie2009