Forensic genetic genealogy has delivered two long-awaited breakthroughs in unsolved violent crimes on the eastern seaboard, demonstrating the rapidly expanding power of consumer DNA databases to unlock decades-old cases. In Massachusetts, authorities in Plymouth County announced that the technique had identified a suspect in the 1991 strangulation of 28-year-old Cherie Bishop, a killing that had been linked by DNA evidence to a 1993 rape of another woman, Donna Bell, in the same Brockton neighbourhood. For more than three decades, the connection remained dormant, a frustration that the county’s district attorney described as a burden carried across lifetimes by the families. Now, after investigators uploaded crime-scene genetic profiles to the Combined DNA Index System and cross-referenced them with public genealogy databases, a single man has been named as the perpetrator, though his identity has not yet been publicly released pending further proceedings.

Across the state line in New Jersey, a separate team of researchers at Ramapo College’s Investigative Genetic Genealogy Center has solved a more fragmentary puzzle. The remains of a murder victim discovered in a shallow grave near Quinton Township, Salem County, in 1979 had lain unidentified for nearly half a century. The body, bearing a single gunshot wound to the head, belonged to Robert Dean Irelan, a young man in his late teens or early twenties who had lived in Pleasantville and was known to frequent Atlantic City. The identification was achieved through the same combination of advanced DNA analysis and genealogical mapping that has increasingly become a standard tool in cold-case units across the United States. Viewed from the research hub in Mahwah, the case exemplifies how even the most unpromising evidence—a skeleton in the woods with no name—can yield to persistent laboratory work.

The two cases, while independent, share a common thread: the reliance on voluntary consumer DNA databases that allow investigators to build family trees from distant genetic matches. Analysts note that this approach has accelerated the resolution of violent crimes from the 1970s through the 1990s, a period when forensic science was far more limited. Yet the method remains contentious, with privacy advocates in London and Brussels warning that its use blurs the line between public safety and mass surveillance. For now, New Jersey State Police are actively seeking the killer of Robert Dean Irelan, appealing for anyone with information about his disappearance or associates in Atlantic City to come forward. In Massachusetts, the suspect’s arrest signals that the reach of genetic genealogy is only growing. The coming years will almost certainly see more such files reopened, as cold-case units around the world begin to adopt what is rapidly becoming the most potent forensic tool since fingerprinting.