Tammy Mahoney, 19, was last seen hitchhiking near the Oneida Indian Nation in 1981. The investigation continues as the reward for information increases. With Nancy Grace today to discuss the facts: Debbie Mahoney, Tammy's sister; Sarah Ruane, FBI Public Affairs; Sheryl McCollum, Forensics Expert and Cold Case Investigative Research Institute Founder; Kathleen Murphy,  Family attorney; Teresa Humphrey - Co-Founder Justice for Tammy and investigative reporter Dave Mack.