The Atlantic

Solving a Murder Mystery With Ancestry Websites

Investigators in Washington have tried for decades to identify a teenage girl who was brutally killed near a lake. They might finally succeed with popular genealogy databases.
Source: Chris Tefme / domnitsky / Berents / Shutterstock / Unsplash / Zak Bickel /The Atlantic

On August 9, 1977, David Roth drove his mother’s car to Silver Lake. It was a hot day for Washington, the temperature slinking toward the high 80s, so he’d decided to go for a swim. He headed about 20 minutes north of Lynnwood, where he slept on his mom’s couch, and parked at a beach just off the road. But his plans changed when he noticed a girl trying to hitch a ride.

She was about 5’10” and slender, wearing cutoff jeans and a low-cut, sleeveless shirt—not bad-looking, Roth thought. Sliding into the 1963 Chevrolet Nova, she said she was on her way home. She told him she lived with two guys in a trailer just south of the lake. It was late in the afternoon, around 4 or 5 p.m., but when he asked if she wanted a beer, she agreed.

Roth was underage, a 20-year-old with bad skin, but he was also tall, 6’5”, his hairline already in retreat. He bought a case of Bud Light at a nearby store and they drove to a wooded area just north of his old high school. After a few drinks, he wondered if the girl would take off her shirt. She stripped down to her shorts, and he grew excited as she let him touch her. But the feeling darkened when she refused to have sex with him.

Roth pivoted, offering an unusual gift in the face of rejection: peacock feathers. Did she want one? There were some in his trunk, and as he retrieved a handful, he also grabbed a bungee cord. Then he walked around to her side of the car, handed her the feathers, and wrapped the cord around her neck. He pulled until he thought she was dead.

When he dragged the girl into some brush, her body started to jerk. Roth took

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