josh mankiewicz: police soon id'd the victim, sam's tutor and friend julie kibuishi. to tell julie's parents. i think, i was screaming, like, no, no, that's not my daughter. it's not my daughter. it's just. josh mankiewicz: julie had been shot twice in the head. her pants were down and someone had written on her sweatshirt the words, "all yours you." police found julie's 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 something sam's friends already knew. he had done some jail time. josh mankiewicz: back in 2002, at 18, sam herr was charged in the murder of another teenager. he was acquitted, but sam's dad knew that, in hindsight, it didn't look good. that doesn't buy you a lot of rhythm from law enforcement. no, and i understood that. that's why it was imperative to start looking immediately. josh mankiewicz: steve wanted to find son to prove he was innocent. orange county prosecutor matt murphy also wanted to f