100 Murder Cases

Donald Harvey, aka The Angel of Death

He worked as an orderly at Marymount Hospital in Kentucky in the '70s and '80s, and claimed he killed 87 people. He'd take patients off life support or put cyanide or arsenic in their IV drips, saying later he believed he was putting them out of their misery. He was caught when cyanide was found in one of the bodies during an autopsy