More than 20 years after a mother found a human jawbone hidden in her son’s rock collection, genetic genealogy experts have unraveled the discovery and identified the partial remains of a US Marine Corps captain.

Adding to the decades-long mystery was that 30-year-old Capt. Everett Leland Yager, who died in a military training exercise in July 1951 over Riverside County, California, was previously thought to have been buried in Palmyra, Missouri.

The Ramapo College of New Jersey’s Investigative Genetic Genealogy Center, which opened two years ago, helped identify the bone as belonging to Yager in March, according to a news release.

The son had inherited the rocks from his grandfather, who was an avid rock collector, according to the Yavapai County Sheriff’s Office in Northern Arizona. In 2002, his mother found the collection, came across what looked to be human remains and contacted the sheriff’s office, authorities said in a statement.

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