The Search for Christie Wilson

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(upbeat music) - Kristi and I, we were young, we were happy, we were enjoying our lives. I never really thought anything like this would have happened to Kristi. Your best friend is missing? How could you be missing? (dramatic music) - We were just gamblers at the casino, having a good time with other people. - The last we know is we see her walking out of Thunder Valley Casino at 1.13 in the morning on October 5th with a man by the name of Mario Garcia, and then she was never seen or nor heard from again. (dramatic music) - Do you remember the first time that you saw the video of Kristi walking out with him? - I absolutely remember that. - She moved away, she moved away from him, look at that. - Yeah, they still remember her arm going like this and off me. - Now surveillance cameras have captured her leaving the casino with an older man. Her family is understandably frantic, and her parents, Pat. - Debbie and Pat have been beacons of hope in this situation. They have endured the unimaginable love, not knowing where your daughter is. Debbie turned that pain into passion. - I want my daughter back, and I want her back now. I may be five foot one and blonde, but they've just met a barracuda and the fight's on. - I'm just gonna ask you straight out. Did you kill Kristi Wilson? - No, I had nothing to do with her disappearance. - All rise. - I think he thought he was gonna beat the case the entire time. If you're in no body, less evidence, I can walk away from this. He never thought he was gonna be convicted. Guilty of a violation. - And when he was convicted and went to prison, he still had a piece of information, and everyone wanted it, and he knew it. - Was she in an ocean? Was she in a ditch for 15 years? I never went to bed without wondering, where is she?
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She was last seen leaving a casino. Her killer was convicted without saying where he left her body. Could her mother and investigators team up to find her body 15 years later? "48 Hours" correspondent Erin Moriarty reports.