New Evidence Renews Mom's Search for Daughter's Killer

Brittany Phillips, 18, attends Florida's Eckerd College on a full chemistry scholarship her freshman year, but the homesick college student returns to Tulsa to continue her education. Within a week, the 18-year-old is dead. Phillips was found raped and strangled inside her locked apartment. Now, a letter has been found with a postmark after the date Phillips was thought to have died, sparking new hope for an arrest.  Joining Nancy Grace today: Dr. Maggie Zingman- Brittany’s mother, Trauma psychologist; Facebook: /Mom.Missing.Brittany Matthew T. Mangino- Attorney, Former District Attorney (Lawrence County), and Author: "The Executioner's Toll: The Crimes, Arrests, Trials, Appeals, Last Meals, Final Words and Executions of 46 Persons in the United States" Caryn Stark- Psychologist- Trauma and Crime Expert; Twitter: @carnpsych Sheryl McCollum - Forensic Expert & Founder: Atlanta's Cold Case Investigative Research Institute; Host of the new podcast, "Zone 7;" Twitter: @ColdCaseTips    Dr. Kendall Avon Crowns-Chief Medical Examiner for Tarrant County (Ft. Worth), & Lecturer for University of Texas Austin and Texas Christian University Medical School   Andy Kopsa- Award-winning Investigative Reporter; Twitter: @AndyKopsa  See omnystudio.com/listener for privacy information.