. >> reporter: costa mesa police detective ed everett responded to the call. >> we have a 20 somethingfemale on the bed, and she's in a position that appears that she was sexually assaulted. >> reporter: police soon i.d. the victim, sam's tutor and friend, julie kibuishi. they had to tell julie's parents. >> i think i was screaming like no, that's not my daughter, that's not my daughter. >> reporter: julie had been shot twice in the head. her parents were down and someone had written on her sweatshirt the words "all yours, f-u." police found her phone in the apartment and saw those weird texts sam had sent her. they learned about his combat tour and how sam sometimes had night terrors. and when police searched his name in their database, they found someone sam's friends already knew. >> he had done some jail time. >> reporter: back in fwo2002, a 18, he was charged in the murder of another teenager. he was acquitted, but sam's dad knew that in hindsight, it didn't look good. >> didn't buy you a lot of rhythm from law enforcement. >> no, and i understood that. that's why it was imperativ