38. Your Nurse is a Serial Killer  Charles was a skilled nurse. He was also a serial killer. In over 16 years as a nurse, he was fired or asked to resign from 5 of the 10 hospitals he worked at. By the time Charles was caught, he had killed at least 29 patients by injecting them with fatal doses of insulin or digoxin. Some believe the number is as high as 400. In this episode, I speak with Joni Johnston.

Joni Johnston is a clinical and forensic psychologist, private investigator, and crime writer. For over twenty-five years, she has worked with offenders and victims in prisons, courts, and hospitals. Joni writes a blog for Psychology Today; she hosts and produces the YouTube channel Unmasking a Murderer and has been interviewed on numerous true crime shows, podcasts, and documentaries. She is also an adjunct professor in Alliant University’s Psychology, Public Policy, and Law Program and a volunteer with the Cold Case Foundation.

NOTES: The episode transcript is here. All links are at astudyincrime.com. Take our listener survey.

You can find Joni at Unmasking A Murderer, drjonijohnston.com, and her newsletter, The Mind Detective. She is the author of Serial Killers: 101 Questions True Crime Fans Ask., and The Human Equation, her blog for Psychology Today.

Sources for this episode include the 2022 Netflix original film The Good Nurse. Actor Eddie Redmayne was nominated for an Academy Award for his role as Charles Cullen.

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A Study in Crime is written and produced by Scott Fulmer, author of the true-crime memoir Confessions of a Private Eye. A veteran private investigator, Scott has spent the last 30 years conducting investigations throughout the US. He’s a decorated combat veteran of the Gulf War and lives in the Texas Hill Country near San Antonio.