Joseph James DeAngelo, the Golden State Killer, charged with thirteen murders and approximately fifty rapes on Monday (local time) in a Sacramento court.
The 74-year-old agent confessed guilt in exchange for evading the death penalty.
DeAngelo was on trial for murders and rapes in the counties of California in the 1970s and 1980s.
Following the agreement with the prosecution and the judge to confess to all charges, the 74-year-old faces life imprisonment with no possibility of parole.
Police tracked down the suspect in 2018 by comparing crime-scene DNA with genetic profiles on websites used to track down family trees.
He turned out to have worked as a police officer in California in the 1970s.