'Sole Survivor' - The 2-Hour 20/20 Event airs tonight at 9|8c on ABC

A serial killer who used the internet as his hunting ground. Listen to a phone call with him & see what happened to the baby who survived his madness. 'Sole Survivor' - tonight at 9|8c on ABC.
2:21 | 09/28/19

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Transcript for 'Sole Survivor' - The 2-Hour 20/20 Event airs tonight at 9|8c on ABC
The bodies scattered between two states. We're in bills did. Yeah these are complete. People and he beat them the definition. No gamble pure and simple he had the whole online subculture to be is hunting ground. He is the first serial killer to transfer those skills onto the Internet there was slight gain Stephen King novel in real life high. That is there was a survivor. It was child. Casey's daughter was still alive. John Robinson. Kills leases. AC Ben takes her four month old baby. Gives birth to his own brother to adopt. Maybe the mother disappeared never handed to child officers Brothers song called the serial killer. We were all wondering it was brother lives in their minds they believe they relief easy enough. It's like the death this time. I don't know how anyone would be able to understand John Smart scene there year after year knowing full well what he had done. As a teenager and she learns for the first time barrel life was alive. You were that missing baby they've been searching for. What are your first memories of uncle John. It's highly likely you are right there when John murdered your mother. Back Taunton in my entire life do you think you won't get some peace if you found what happened to her absolutely. I'll find her. Hero phone call with the killer and a yeah. Top. Top notch yeah. Letter signed. Just released now after nine years UD TLC you have to see it shows still believe it was big shocking. And for the first time an emotional Finley meeting that was once unimaginable to. The sole survivor the Friday night 2020. Friday at 9:8 central and he soon I am rule.

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

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