Nancy Grace is joined by Cold Case Investigative Research Institute Founder Sheryl McCollum  to break down the evidence against accused Long Island Serial Killer, Rex Heuermann. The architect's computer searches shows disturbing title of bondage, torture and  child pornography. The accused killer also drives a Chevy Avalanche described by a witness. He's caught on surveillance video buying more minutes for a burner phone. Investigators have determined a hair found on one of the victims is a DNA match to Heuermann's famliy.