don't catch these people. >> reporter: at the crime scene, detective arnold was searching for answers, combing the house for more clues. >> a closet that contains a safe. >> reporter: contents, apparently missing. >> the first thing is a robbery. >> next to that is a cell phone. >> we check cell phone records. >> reporter: she received two phone calls in the hours before the shooting, both from a family friend. james had known erin for years. he called her. police brought him in to see if he had any information that could help the investigation. >> one of the very last people to call her or talk to her by phone, which is why we want to talk to you. >> me? >> reporter: he provided names for investigators to check out