Jonelle Matthews, 12, disappears from her family home in Greeley, Colorado, after a school concert. Footprints are found outside the home. Nothing is disturbed inside, but Jonelle is gone. Decades later, her body is found in 2019, but police are no closer to solving the crime. Now there's been an arrest. Who killed Jonelle Matthews?Joining Nancy Grace today:Ashley Willcott - Judge and trial attorney, Anchor on Court TV, www.ashleywillcott.com  Dr. Daniel Bober - Forensic Psychiatrist, Chief of Psychiatry Memorial Regional Healthcare Systems, Assistant Clinical Professor at Yale University School of Medicine, follow on Instagram at drdanielboberRorbert Crispin; Private Investigator “Crispin Special Investigations”  www.crispinsinvestigations.com Joe Scott Morgan - Professor of Forensics Jacksonville State University, Author, "Blood Beneath My Feet" featured on "Poisonous Liaisons" on True Crime NetworkLevi Page - Investigative reporter Crime Online Leigh Egan - Crime Online Investigative ReporterStewart Jacoby - former Reporter KMGH TV Denver