How genealogical websites helped investigators pinpoint alleged Golden State KillerThe Santa Barbara County District Attorney also announced that Joseph James DeAngelo could face a sentence of life without parole or the death penalty if convicted in the cases her office has filed.
He is facing charged for two killings in Ventura County and two in Sacramento County.
On May 10, authorities in Santa Barbara County additional four new murder charges to the slate.
DeAngelo, 72, was charged with killing two people - Robert Offer man and Alexandria Manning - on December 30, 1979, and with the 1981 killings of Cheri Domingo and Gregory Sanchez in Goleta.
He then carried out multiple killings in Ventura and Orange counties before returning to the Santa Barbara area where he killed Domingo and Sanchez.
He was initially charged with eight counts of murder, but have four more added to his docket this week.
DeAngelo now faces four counts of first-degree murder with special circumstances in Santa Barbara, though it was unclear when he might appear in court there.
DeAngelo, who has adult children, was a police officer in Exeter in central California from 1973 to 1976, officials said. They got lucky: a match with family members led them to identify and arrest Joseph James DeAngelo.
"We never stopped hoping or believing that an arrest would be made", Dudley said.
Investigators say DeAngelo - who worked as a police officer in the Central Valley and in a foothill town east of Sacramento in the 1970s - committed crimes in the Sacramento area, the San Francisco Bay Area and Southern California.
DeAngelo's attorney, Diane Howard, did not immediately respond to an email seeking comment.