nathan had told police he only knew of one key, the key that was found at the crime scene. but now police had a second key that they found in this trash can in the park. they believe nathan was lying to them and that he had used that key to move the car. another suspicious finding? a black hooded sweatshirt on the floor of nathan and denise's bedroom. investigators said it seemed to match the one a strange man was seen wearing in the neighborhood that day. >> it appeared to us that somebody was in a hurry, took it off, threw it down. >> reporter: but something else was even more troubling. police had ordered an extensive analysis of nathan's laptop and a couple of weeks after the murder they received a report. >> the expert said his browser said he was attempting to delete everything he looked up, but just because you delete it doesn't mean it's gone. >> reporter: what they found floored him. >> how to silence a .40 caliber handgun, glock specifically the gun he owned and she was shot