DNA testing has helped to identity a teenage boy who was among four victims of a notorious serial killer to be buried in the 1980s at an abandoned farm in Indiana.

For nearly 40 years, the child has been known only as Adam Doe, one of many teenage boys and young men believed to have been murdered between 1982 and 1984 by Larry W. Eyler. Known as the “Highway Killer,” Eyler was suspected of killing more than 20 people, most of whom were discovered near interstates in several Midwest states.

But four of Eyler’s suspected victims were found in 1983 on an abandoned farm in rural Lake Village, Indiana. On Tuesday, Keith Lavell Bibbs, 17, of Chicago, was identified as the last remaining victim found on the farm, the DNA Doe Project and the Newton County Coroner’s Office both announced.

“This significant breakthrough comes after years of exhaustive efforts, and it brings closure to a case that has puzzled investigators and haunted families for decades,” Pam Lauritzen, a spokesperson for the nonprofit DNA Doe Project, said in a media release.

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News of the break in the decades-old case comes at a time when modern-day serial killers have once again captured the public’s attention.

Just since May, several men have been arrested and charged in cities across the United States for killing sprees that gained national media coverage.