The Golden State Killer, and the Family Tree That Caught Him

California spent the 1970s and 1980s hunting three separate men. In Sacramento there was the East Area Rapist, who broke into suburban homes at night, bound couples with shoelaces, and stacked dishes on a husband's back so he would hear if the man moved. In the Central Valley there was the Visalia Ransacker, a burglar who took nothing of value and left households rearranged. And in Southern California there was the Original Night Stalker, who killed couples in their beds. Each had his own task force. Each went cold.

It took until 2001 for laboratory DNA comparison to establish what a few investigators had long suspected: the Northern California rapist and the Southern California killer were the same person. The crime writer Michelle McNamara later gave the composite figure the name that stuck — the Golden State Killer — in the years of obsessive research that produced her book I'll Be Gone in the Dark. She died in 2016, two years before the answer arrived.

The tree instead of the man

The breakthrough did not come from the criminal DNA databases, where the killer's profile had sat unmatched for years. It came from the consumer genealogy boom. Investigators, working with genetic genealogist Barbara Rae-Venter, uploaded the crime-scene profile to GEDmatch — an open database where hobbyists compare results from commercial ancestry tests — and looked not for the offender but for his cousins.

The matches were distant, third and fourth cousins sharing a fraction of DNA. From those fragments the team built family trees backwards into the nineteenth century and forwards again, thousands of names, narrowing on branches that intersected in California and eliminating men by age, geography, and eye colour. The tree closed around a single household, then a single man: Joseph James DeAngelo Jr., seventy-two years old, a retired truck-fleet mechanic living in a suburb of Sacramento — and, during the years the East Area Rapist was active, a serving police officer, fired in 1979 for shoplifting a hammer and dog repellent.

We found the needle in the haystack, and it was right here in Sacramento.

— Sacramento County Sheriff Scott Jones, 25 April 2018

Surveillance teams collected discarded DNA — from a car door handle, then from a tissue in his kerbside bin. Both samples matched the crime-scene profile. He was arrested outside his home on 24 April 2018 while, by his neighbours' account, making dinner.

What the solution cost

In June 2020, in a hearing held in a university ballroom to accommodate distancing rules and the number of survivors who came, DeAngelo pleaded guilty to thirteen murders and admitted dozens of rapes that could no longer be charged because the statute of limitations had run. He spoke in a thin voice that several survivors said was nothing like the whisper they remembered. He was sentenced in August 2020 to life without the possibility of parole.

The case did not only close a file; it opened a technique. Investigative genetic genealogy has since resolved hundreds of cold cases and unidentified remains across the United States, and has forced an unfinished argument about consent, since the people whose DNA solved the case had uploaded it to find grandparents, not killers. GEDmatch changed its policies within a year. The debate is still running — but the forty-year hunt for three imaginary men ended with a family tree.