An ex-police officer accused of being the Golden State Killer, a serial predator who terrorized much of California with a string of slayings, rapes and break-ins over 10 years, pleaded guilty on Monday to multiple murder and kidnapping charges.
DeAngelo's guilty plea will result in 11 consecutive life sentences to state prison without the possibility of parole.
Resolving the case with a deal "at this time" would allow the remaining victims and families to "hear the defendant admit that he committed these acts and crimes".
"The family members of the murder victims have waited for decades for justice for their loved ones", added Holliday.
A free genealogy database led authorities to Joseph James DeAngelo, whose 2018 arrest brought an end to investigations into dozens of burglaries, kidnappings, rapes and murders dating back to 1975.
He was initially charged with only the 1978 murders of Brian and Katie Maggiore, a newlywed couple who were shot dead in Rancho Cordova, a Sacramento suburb, while walking their dog.
He went on to plead guilty and admit to additional charges and allegations as prosecutors from 11 California counties took turns presenting statements graphically detailing every rape, murder, and home invasion with which DeAngelo was accused.
The statute of limitations for the rapes have expired, but all offences were read out by prosecutors in a hearing that stretched over seven grisly hours.
He is 74 years old and terrorised the state in the 1970s and 1980s. His admissions encompassed a total of 161 uncharged crimes, prosecutors said. DeAngelo used to be a police officer and was also a Vietnam veteran.
Along the way, the meticulous masked assailant was given a number of other nicknames including the East Area Rapist, the Diamond-Knot Killer and the Original Nightstalker.
The breakthrough came about two months after the case gained renewed national attention in the bestselling book I'll Be Gone in the Dark by Michelle McNamara, which was published posthumously two years after the author's death and has recently been made into an HBO documentary series.
By a mid-morning recess, Sacramento Superior Court Judge Michael Bowman had accepted DeAngelo's guilty pleas to nine counts.