'Undercover Girlfriend' - The 20/20 Event airs Tonight at 9|8c on ABC

Every parent's worst nightmare - their child vanishes. Now, watch the 'Undercover Girlfriend' who brought down a killer. The new 20/20 television event premieres tonight at 9|8c on ABC.
2:07 | 11/10/19

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Transcript for 'Undercover Girlfriend' - The 20/20 Event airs Tonight at 9|8c on ABC
It's a parent's room nineteen mirror. Send your kids to school. You may never. Come back. None of the smooth sides. She's so new and suddenly just managed 26 year old he means anxious to hear. From campuses term from missing persons kidnapped. As do that our guys out recently got straight I mean I'm just thinking don't get the heart of are. The suspect in this case was not an all some nefarious. It's person outside looking in his ten day monitoring and I'm in debt physics grad student. Considered. For though is still. Very Christians so they throw someone and ask Christians girlfriend to Wear a wire. Pakistan needs Thursdays and Tony such as girls this is somebody who is intimately. This thing and pain and those seem. This was a very risky proposition. And then all of the sudden everything. I want. Him. If you want to hang got this absolutely blown away it's crazy it's just chill idly there is Evelyn. People team evil thing. He ultimately. He says. Woman. Brent knows. And everything about family wanting to find the bodies of daughter when you ask. And he stuck. A master and save China from. Middle America. Yeah. Champs this surveillance video as the miracle. Her mom yeah. Yeah sure is literally and. 22 when he chew our special two Friday at nine need centralized Eee PC.

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

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