Ventura and Orange counties also have warrants out for his arrest, according to Dudley.
DeAngelo was arrested April 24 at his home in the suburb of Sacremento.
DeAngelo allegedly went on a decades-long crime spree involving murder, assault, and almost 50 burglary and rape charges from crimes committed between 1976 and 1986.
Offerman was originally from Dyersville and a graduate of Loras College.
Sanchez and Domingo, also a couple, were housesitting in Goleta when they were killed on July 27, 1981.
The Golden State Killer is suspected of committing at least 12 murders and more than 50 rapes during the 1970s and 1980s from Northern to Southern California.
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The latest charges in Santa Barbara County are in the deaths of Cheri Domingo and Greg Sanchez (Oct. 27, 1981) and Drs.
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.
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. They then reportedly obtained a discarded sample of DeAngelo's DNA, which matched the suspect DNA.
"Violent cold cases never grow cold for the victims or their loved ones", Dudley told the Los Angeles Times.
"Mr. DeAngelo is presently in custody in Sacramento", she said.
"Many important issues were discussed, but no decisions were made regarding where the case may be tried or the composition of the trial team", Orange County District Attorney's Office officials said in a written statement released Friday afternoon. "In fact, majority spend their lives feverishly seeking answers and desperately hoping for justice".