four marines died and where this suspect was eventually gunned down and killed by police. the forensic investigation is still going on well into the night. you can't see it right now, but just about an hour and a half ago, there were still dozens and dozens of federal agents combing the scenes, looking for anything they could find. even flew a drone over the scene taking pictures, very high res pictures to see what's going on. >> i want to get to gary tuckman now in the suspect's neighborhood of hixon, tennessee. i understand you were close to his house. what's the latest going on? >> well, don, forensic investigation here, too. this upscale, suburban neighborhood is the neighborhood where this gunman spent most of his life. right now, we have the f.b.i. and other authorities searching across the house.