‘30 Years Searching’ - The 2-Hour 20/20 Event - tonight at 9/8c on ABC

A beautiful 18-year-old girl vanishes. Now, the chilling cold case is finally solved after 30 years. Heart-stopping new details & interviews – ‘30 Years Searching’ – tonight  at 9/8c on ABC. 
2:43 | 09/14/19

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Transcript for ‘30 Years Searching’ - The 2-Hour 20/20 Event - tonight at 9/8c on ABC
It was such a mystery I mean beautiful eighteen you all Smart strong women don't just van. An extensive search for a missing teenager everyone knows there is Mandy and her brother who was visiting and they weren't actually saw her run one direction and then a few minutes later around the other way. There was the last person to see him this was my. Evening is trying to hit Washington County it was a huge news story send us things don't happen armchair anything. You know big city. People were very aware of this horrific crime a young girl that was brutally. Mandy left her home on the day after Thanksgiving. She wanted to get in Iran it's kind of in the late afternoon she left with their daughter Kyra. She had been gone longer than usual for her run and when she didn't come back when she should have come back and then the dog came back with our. I was panicky. First person I callables her boyfriend. Marriage worried that when he was missing that I got word three days later she missed out. And remember. Could've done this it. Could offend anyone. And everywhere we went. Could have bend the person that did this week people are scared to go jogging wasn't just somebody driving by that drove up that road or was it somebody that knew her and maybe it was a name and maybe it was a friend. Could possibly imagine he's living I don't think that's ever believed. Ever. They were cachaca. My god the display went off my you know I think it figured Kilmeny savage. I think this is too good to be true Islam where he was quiet keeps on all I think once he realized they actually do them as the then he swears. Oh. A candidate can't. We all have them do that was. The ads she is witty way out of this week. Tipped but it bluntly it's experience that someone would show up on his doorstep baton passed. A man. That might miss I never would have guessed it was stunning how could this happen after so long haul thirty years later today it's. I don't what I had in my hand I dropped him he was site can be kidding me. I wish I hots for Lycos hold my breath thirty years shortstop. 30 years searching Friday night September. I need central on AB CM.

This transcript has been automatically generated and may not be 100% accurate.

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