Delving 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.
A rising pop star, Selena Quintanilla, is gunned down by her fan-turned-manager, Yolanda Saldivar. What led to this tragic betrayal? (S3, ep 1)
A shocking double murder plot revealed after decades. A tale of sex, religion and greed, that deeply affected the Irish community. (S3, ep 2)
Gail Katz's family thought her disappearance was solved when a torso washes up, but the truth unfolds thousands of feet above the ocean. (S3, ep 3)
A charming doctor, Dr Michael Swango, was a fraud and murderer, believed to have left dozens of victims in the US and Africa. (S3, ep 4)
Eleven elderly residents of a Sydney care home die in a fire. Nurse Roger Dean's role in the tragedy goes beyond mere assistance. (S3, ep 5)
A hospital in Indiana sees a death rate triple in a year thanks to nurse Orville Lynn Majors, who could have been behind as many as 100 deaths. (S3, ep 6)
Two double murders five years apart take place in Omaha Nebraska. Could a doctor connected to the victims, fuelled by rage and revenge, be to blame? (S3, ep 7)
A mother dies after a facelift. Her daughters suspect their father, and doctor, of having a role in her unexpected death. (S3, ep 8)
A Newcastle care home loses two residents in two days due to a nurse's disdain for the elderly and a history of pathological lying. (S3, ep 9)
On a November evening, a woman calls 911 for her husband Greg after finding him unresponsive and, bizarrely, covered in rose petals. Is it murder? (S3, ep 10)
Death rate triples on a hospital ward linked to nurse Kristen Gilbert. Could this seemingly typical 'soccer mom' really be a killer? (S3, ep 11)
A nurse in a doctor's white coat is linked to mysterious patient deaths at a medical centre, but even his shock confession can't bring him to justice. (S3, ep 12)
A small hospital in Chillicothe, Ohio, sees 18 'code blue' emergencies and nine suspicious deaths, leading to a decades-long criminal investigation. (S3, ep 13)
Charli Darragh urges her mother to complain about a nurse's treatment at her care home, never imagining it would lead to her mother's death. (S3, ep 14)