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Source: ABC

'20/20' Dives Into the Murder of Sarah Stern by So-Called Friend Liam McAtasney

By Amber Garrett

If not for a secretly recorded confession, Liam McAtsney might have gotten away with murder — literally. When his childhood friend Sarah Stern was presumed dead, her car abandoned on a New Jersey bridge between Belmar and Neptune with the keys still in the ignition, it seemed the 19-year-old had committed suicide. 

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Source: ABC

In reality, someone she knew and trusted since first grade had been planning her murder for six months, intending to rob Sarah of her inheritance before strangling her and throwing her body over the bridge with the help of his roommate (and Sarah's junior prom date), Preston Taylor. 

Here's an overview of the convicted killer's crimes, his accomplice, and the man who helped clinch the conviction.