Donald Harvey, 64, who pleaded guilty to killing more than three dozen people at hospitals in OH and Kentucky in the 1970s and 1980s, was pronounced dead Thursday morning after suffering critical injuries inside his cell at the state prison in Toledo.
An Ohio prisons spokeswoman says the 64-year-old Harvey died Thursday, two days after troopers say he was found beaten at the state's prison in Toledo. Harvey, who was serving multiple life sentences, was found beaten in his cell Tuesday, March 28, 2017 at the state's prison in Toledo, state officials said.
He had worked as a nurse's aide at hospitals in Cincinnati and London, Kentucky, and claimed he was trying to end his patients' suffering.More news: Speaker shares Trump criticism of Freedom Caucus
The now 64-year-old took a plea deal to avoid the death penalty.
An initial incident report of the prison attack, obtained by PEOPLE, says "the suspect entered the victim's cell at Toledo Correctional Institution and assaulted him", but it does not identify the attacker.
Harvey was sentenced in 1987 for the murders of 25 people, majority at Cincinnati's Drake Hospital, according to a previous TIME report. "They just pronounce him dead and send him straight to his funeral home". He has also claimed responsibility for a further 18 deaths. And they'd always come in with this kind of superior attitude. "I'm not a mean person, and I forgive and forget, but all the families of the people in the hospital, their friends, even the man he lived with, how can you do that to people?"More news: Atletico Madrid 'closely monitoring' Arsenal star Alexis Sanchez amid Chelsea transfer links
Harvey used arsenic and cyanide to poison most of his victims, often putting it in the hospital food, prosecutors said. Others he suffocated by letting their oxygen tanks go empty.
His spree was uncovered during an autopsy on one of his Drake Hospital victims, after a doctor detected a whiff of cyanide and traced the death back to the hospital orderly.
Prison records show he is serving a life sentence and eligible for parole in 2043.More news: Beauty and the Beast