Kenneth Douglas, 60, worked as a morgue attendant in Ohio, USA, between 1976 and 1992, where he committed the sexual crimes against the dead women while working the night shift.
He admitted in court that he sexually abused three corpses while he was drunk or on drugs, but he had sex with up to 100 bodies, he said in a deposition.
The former morgue attendant's crimes have only come to light in their entirety after the families of Douglas's victims were told they could sue Hamilton County in Ohio by a Federal appeals court.
The county now faces a Federal lawsuit and huge legal bills after a panel cited evidence that Douglas's supervisors knew he was getting drunk and having sex with corpses while on the job.
Douglas said, in a court deposition, that he would attack the dead women if he was high on drink or drugs.
His wife complained that he "reeked of sex" when she picked him up from work. She said she told officials but nothing was done.
His victims included 23-year-old Charlene Appling, with whom he had sex with on the day she died after being strangled while six months pregnant.
Another victim was 19-year-old Karen Range: Douglas was caught when DNA from his semen was found inside Range's body.
Douglas's crimes only came to light when the killer of Range, David Steffen, appealed his conviction for rape and murder.
In 2008, Douglas admitted his guilt in the Range case and was sentenced to three years in prison.
He pleaded guilty to two more cases in 2012.
