A notorious serial killer known as the "Angel of Death" is in a critical condition after being beaten up in his OH prison cell, according to authorities.
He had been in critical condition after he was found injured at the Toledo prison on Tuesday.
Harvey, 64, accepted a accepted a plea bargain for killing 37 people in 1987, although he has admitted to as many as 64 deaths.
The 64-year-old is serving multiple life sentences for the murder of 37 people, mostly by poison, in Cincinnati and Kentucky.
A report provided by the patrol says the assault occurred inside his cell about 2:20 p.m. Tuesday. He later claimed to have killed 18 others while working at a veterans' hospital in Cincinnati. Many of his victims were chronically ill patients, and he claimed he was trying to end their suffering.
The beating left him on life support, and medical personnel did not expect him to survive, WCPO-TV reported Wednesday citing local law enforcement sources.
In this November 2, 1987, file photo, convicted killer Donald Harvey, center, is led back to jail by Laurel County, Ky., Sheriff Floyd Brummett, left, and an unidentified deputy after pleading guilty to eight murder charges and one voluntary manslaughter charge in London, Ky.
He said he was a mercy killer - putting patients out of their misery - but he also said the first patient he killed had just made him angry. "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?"
He killed most of his victims by poisoning their hospital food with arsenic and cyanide. Some of the patients were suffocated when he let their oxygen tanks run out. He was finally caught when a coroner smelt cyanide on one of his victims. He is presently service multiple life sentences and will not be eligible for parole until 2043, when he would be 91 years old.