Donald Harvey: The Angel of Death

In 1987, the body of John Powell, a patient under mysterious circumstances, went to autopsy, where the examining pathologist smelled cyanide as soon as he opened the stomach. That detection changed Powell's death from accident to homicide, prompting investigators to dig deeper. Their inquiry led them to Donald Harvey, a hospital worker who admitted to using cyanide, arsenic, suffocation, and other methods to kill patients. Harvey eventually confessed to 37 murders, and he was only apprehended due to a medical examiner with the genetic ability to detect cyanide.

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