Say. i mean he s been a screw up. he was famous for doing stupid things. the epitome of stupidity, but nothing aggressive, nothing violent. reporter: juvenile pranks, unpaid traffic tickets, those were his worst offenses said his parents. and, they were sure their once married son would never hurt a woman. much less do what happened to amber. if anything i ve put into him how to treat women, and how i feel about beating women up, and rape, and that culture. i m a nurse, for god sake, so yes, he understands. reporter: sam moon was an unlikely suspect, for sure. and he had offered alibis. so, detective seymour checked them out, one by one. remember how he said he looked under his bedroom door and watched his friend, bryce bailey commit the crime? i went to the home, i looked
Did it feel a bit like that? a little bit, yes. reporter: mostly guys, and soon fast friends like bryce bailey, a boyfriend buddy. and prices childhood pal, a friendly guy named stephen moon who crashed on the couch, everybody called him sam. gradually, they and the other house made helped amber learn to smile again. particularly sam, a bright gentle guy. good listener. just what amber needed. stefan was really supportive. reporter: did you tell him what your situation was and what happened to you? yes. he said, you know, i m so sorry, would you like a hug, you should never have to go through that, no one should have to go through that. reporter: hope to feel better? it did. reporter: to her best friend kirstie, it look like the old amber was beginning to emerge again. she was settled in and happy, that was a place for her to
That s how police got sam s dna. and bryce? back and forth. he was eager to provide me with a sample of his dna to exonerate him. reporter: then, bryce said this about his old friend sam. the kid he had known since they were five years old. the only thing i could tell you about sam is he is a constant liar. reporter: the heart of sam s alibi was his claim that he had sex, and only sex with amber, after reading a craigslist ad, offering free sex in the park. these days craig slip doesn t post ads like that. but in 2013, when they did well, investigators asked craigslist, was there any such add at the time. that one took a while. we did a search warrant for specifics keyword like stefan had used in his interview about
reporter: again, he offered up his craigslist story that he responded to a personal ad, a woman offering free sexual favors in the park, that s why his dna is showing up. i had just gotten separated from my wife. i went out that rosboro park. i had sex with a girl. i didn t see her face. i didn t see anything about her. nothing. reporter: and afterwards, he said, he went home and told his roommate, bryce bailey. there s a girl in the park offering free sex. you should go there. after an hour to, he comes through the door, i can hear he s with somebody else, and it s a female. reporter: sound said he believed bryce went to the park, brought the woman back to the house.