They know how to kill and how to cure. Inside a hospital, at home, or maybe even next door. They are trained to save lives but also know how to take them. Delve into the stories of killers who broke the Hippocratic Oath to use their medical knowledge for murder, taking the lives of often vulnerable victims instead of caring for them.

Charlie Cullen was an experienced registered nurse, trusted and beloved by his colleagues at Somerset Medical Center in New Jersey. He is also one of history’s most prolific serial killers, with a body count potentially numbering in the hundreds across multiple medical facilities in the Northeast.