Before nurse Amy Loughren helped police capture her fellow colleague, the serial killer Charles Cullen, there were several others who attempted to do so and "risked their careers" by becoming whistleblowers, author Charles Graeber told Newsweek.

Graber penned The Good Nurse: A True Story of Medicine, Madness, and Murder, the nonfiction book that inspired Netflix's film of the same name starring Jessica Chastain and Eddie Redmayne. For his book, Graeber interviewed Cullen extensively and also heard the stories of those who tried to stop Cullen during his 16-year career as a nurse.

Cullen is currently serving 18 consecutive life sentences for the murders of 29 patients —committed in nine hospitals between 1988 and 2003—but authorities believe he is responsible for the deaths of 400 people. He killed patients by giving them a lethal overdose of drugs like digoxin and insulin, which he often would inject into IV bags in a storeroom.

'Good Nurse' Author Charles Graeber on the Other Whistleblowers Who Tried to Stop Charles Cullen

While The Good Nurse focuses on Loughren's part in the investigation into Cullen, there were other people who came before her with evidence of Cullen's crimes. Some evidence even came to light at the first hospital he worked in Saint Barnabas Medical Center in Livingston, New Jersey, Graeber explained.

The stories of these whistleblowers will be shared in Netflix's new documentary Capturing the Killer Nurse, set to premiere on November 11.

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