Megan Molteni in Wired:
For the dozen years between 1974 and 1986, he rained down terror across the state of California. He went by many names: the East Side Rapist, the Visalia Ransacker, the Original Night Stalker, the Golden State Killer. And on Wednesday, law enforcement officials announced they think they finally have his real name: Joseph James DeAngelo. Police arrested the 72-year-old Tuesday; he’s accused of committing more than 50 rapes and 12 murders.
In the end, it wasn’t stakeouts or fingerprints or cell phone records that got him. It was a genealogy website.
Lead investigator Paul Holes, a retired Contra Costa County District Attorney inspector, told the Mercury News late Thursday night that his team used GEDmatch, a no-frills Florida-based website that pools raw genetic profiles shared publicly by their owners, to find the man believed to be one of California’s most notorious criminals. A spokeswoman for the Sacramento County District Attorney’s Office reached Friday morning would not comment or confirm the report.
GEDmatch—a reference to the data file format GEDCOM, developed by the Mormon church to share genealogical information—caters to curious folks searching for missing relatives or filling in family trees. The mostly volunteer-run platform exists “to provide DNA and genealogy tools for comparison and research services,” the site’s policy page states. Most of its tools for tracking down matches are free; users just have to register and upload copies of their raw DNA files exported from genetic testing services like 23andMe and Ancestry. These two companies don’t allow law enforcement to access their customer databases unless they get a court order. Neither 23andMe nor Ancestry was approached by investigators in this case, according to spokespeople for the companies.
But no court order would be needed to mine GEDmatch’s open-source database of more than 650,000 genetically connected profiles.
More here.