Dudley said she plans to meet Friday in Santa Barbara with the district attorneys from the other three counties to begin discussing how the various prosecutions will proceed.
Diane Howard, from the Sacramento County Public Defender's Office and who is DeAngelo's attorney on the Sacramento charges, was not immediately available for comment.
He could face the death penalty or life in prison without parole if convicted on any of the murders.
Joseph James DeAngelo makes his first appearance to face charges that include homicide and rape, in Sacramento County Superior Court in Sacramento, Calif., April 27, 2018.
A retired police officer who investigators believe is the "Golden State Killer" has been charged with four more counts of murder, bringing the number of slayings he is charged with to 12.
As CrimeOnline previously reported, the Golden State Killer is thought to be responsible for a dozen murders and 50 rapes, all crimes committed across 10 CA counties in the decade between 1976 and 1986.
Kenyan rose-farm dam bursts, 'sea of water' kills 47
Some residents told local newspaper The Nation that they heard an explosion before water poured out of the stricken structure. Witnesses said they heard a loud bang before the waves swept through almost 2km of farmland where many people live and work.
Prosecutors say DeAngelo, a former police officer, was one of California's most elusive serial killers.
The latest charges in Santa Barbara County are in the deaths of Cheri Domingo and Greg Sanchez (Oct. 27, 1981) and Drs.
"Violent cold cases never grow cold for victims or their loved ones", Dudley said.
Officials believe the Golden State Killer fatally shot Dr. Robert Offerman and Alexandria Manning in December 1979 near Goleta. Investigators found DeAngelo after scouring dozens of family trees on genealogy websites for possible DNA and profile matches.
No charges have been filed in Santa Barbara County, however.