Samuel Little, a man described by the FBI as the most prolific serial killer in US history, has died aged 80.
Little died in a California hospital on Wednesday, the state Department of Corrections and Rehabilitation said.
He was serving a life sentence for the murder of three women. But by the time of his death, he had confessed to killing 93 women between 1970 and 2005.
Little targeted vulnerable individuals, many of whom were sex workers or drug users, officials say.
A former competitive boxer, Little would knock his victims out with punches before strangling them - meaning that there were not always obvious signs, like stab or bullet wounds, the person had been murdered.
Instead many deaths were incorrectly determined to be overdoses or accidental and were never investigated. Some bodies have never been found, the agency said.
Last year, the FBI said its analysts believed all of his confessions were "credible".
They also released images of the victims he drew while in prison in an attempt to trace those he killed.
Samuel Little: America's 'most prolific' serial killer dies
Samuel Little is thought to have killed 93 women, with his murders going undetected for decades.
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