we need you to weigh outside of the house for the police officer safety. >> the detective was soon on route to the lane. he still had a garbled account from the 9-1-1 call. who had shot who? >> he's trying to protect me. >> your son was trying to protect? you yes. >> it looked like it was what we call the domestic murder. something had just occurred. >> on arrival the first deputies on the scene, saw a young man who turned out to be the 19-year-old charlie tan. standing in the driveway with his mother. >> they're outside the? house >> there outside the. house it's a safety thing for the detective, let those people come out, there's no reason to go in. they asked to results was in the. house >> in the next opponents the deputy her to sunday tell a story that sounded like self-defense. he had to shoot he said, to save his mother, he used the shotgun. >> charlie said my dad's in there. he's dead. i had to do. it he was going to hurt my mom. >> the father was shot because