Charles Cullen, known as “The Angel of Death,” was a nurse who turned hospitals into his killing grounds. Over sixteen years, he quietly murdered dozens of patients in New Jersey and Pennsylvania by injecting lethal doses of medication into IV lines. His victims were young and old, men and women, and his motives blurred the line between mercy and malice. Protected for years by hospital bureaucracy and institutional silence, Cullen’s crimes went undetected until a brave colleague helped expose him, revealing one of the deadliest healthcare serial killers in American history.