 It's a lead that allows us to decide in what direction to take this case. But he says due to privacy concerns, investigators can't go straight to this method. It takes a judge's order. In the killing of Leslie Prier. In order to get this, we had to get a search warrant. And you had to prove that you had exhausted all other potential avenues. They would get the order and then they got a hit. Looking at 44-year-old Eugene Gligor. And they matched DNA found at the crime scene to DNA found on a water bottle he threw out at Dulles International. Mike Murillo, WTOP News.