Paul Novak's outwardly heroic persona as a post-9/11 paramedic concealed a dark side that culminated in the brutal murder of his estranged wife Catherine in their Sullivan County home.

Malcolm Webster’s wife, Claire, died in a car crash in a remote part of Scotland, and he was apparently inconsolable. When his second wife, Felicity, almost died in similar circumstances in New Zealand and money is missing, suspicions were raised.

Kathy Augustine was a politician serving in the Nevada Senate. Shortly after her husband of 17 years died from complications of a stroke, she married Chaz Higgs, a critical care nurse whom she met while he was caring for her late husband.

In 2016, American Bianca Rudolph is found dead in her hunting lodge in Zambia. Deemed an accident by the authorities, her husband of 34 years, multimillionaire dentist Larry Rudolph moves on with his life with his lover.

44-year-old Colombian Clara Harris moves to America in the 1980s and opens her own successful dentistry practice. She had two sons with her orthodontist husband, David Harris. They seemed like the perfect family, but they’re not.

Two brilliant minds, one with murderous intent. The tragic death of Dr Autumn Klein came at the hands of her husband, Dr Robert Ferrante, whose knowledge of cyanide poisoning meant his wife would never divorce him.

When 62-year-old Lynn Hernan is found dead at home, it’s presumed she has taken her own life. No one suspects her carer and treasured friend Jessy Kurczewski. But what unravels is a tale of greed and lies, and a very unusual killing method.

Nurse Genene Jones is believed to have killed as many as sixty children in her care by injecting them with muscle relaxants and other drugs. One bereaved mother leads the charge to bring her to justice.

Nicknamed Dr Death, neurosurgeon Christopher Duntsch destroys the lives of many who end up in his operating theatre, in two cases resulting in death. His work is so substandard that people are led to question whether he is even a doctor.

A man is found dead at home after a fire, but everything is not as it seems. His death was caused by something else something of which a nurse, like his wife, would have considerable knowledge.

A rising pop star, Selena Quintanilla, is gunned down by her fan-turned-manager, Yolanda Saldivar. What led to this tragic betrayal?

A shocking double murder plot revealed after decades. A tale of sex, religion and greed, that deeply affected the Irish community.

Gail Katz's family thought her disappearance was solved when a torso washes up, but the truth unfolds thousands of feet above the ocean.

A charming doctor, Dr Michael Swango, was a fraud and murderer, believed to have left dozens of victims in the US and Africa.

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.

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?

Something was wrong at DaVita dialysis centre in Lufkin, East Texas, with a huge increase in code blues. Patient after patient was taken to the nearest hospital, many succumbing to their injuries.

William George Davis, a nurse in Tyler, Texas, was just 32 when he began a reign of terror over patients recovering from heart surgery. Prosecutors claimed that Davis had at least eleven victims, of whom seven died.

When Eric Lloyd died at home, his wife claimed it was from natural causes. Marie Whiston had been looking after him between nursing shifts at their local hospital and was anxious to attribute his death to ill health.

From February to April 1991, Beverley Allitt's reign of terror at Grantham Hospital led to the deaths of four children and serious harm to many others. Her background revealed troubling signs of Munchausen's syndrome, manifesting at an early age.

Within two years of Dr Lisa Tseng starting her career in Rowland Heights, Los Angeles, the demographic pattern of her patients dramatically changed, with largely young men travelling long distances to seek pain medication.

All Jessica Patel from Middlesbrough wanted was a loving husband and a family of her own. She married her first love, Mitesh, but soon her dreams were shattered when he proved psychologically and physically abusive.

Dr Harold Shipman, a respected GP, murdered some 250 patients. Despite suspicions raised by colleagues, it took years for the authorities to catch up with him. Murder by Medic reveals a shocking pattern of abusing trust.

In little more than a year after Reta Mays started work as a nurse’s assistant in the VA centre, there were 21 suspicious deaths. The FBI launched an investigation, leading to the exhumation of some of her victims.

Dr. Bob Neulander found his wife, Leslie, covered in blood in the bathroom, having apparently fallen. Initially, her death was ruled an accident, but due to local rumours the DA reopened the investigation.

Over the course of just a few months, Vickie Jackson murdered at least ten people. An investigation found a suspicious syringe in Jackson’s trash, and bodies were exhumed to test for the lethal drug.

The unbelievable story of a serial-killing Canadian nurse, who walks into a police station of her own free will and confesses to a murderous rampage. Her detailed recounting of each death is chilling.

A hospital thrown into chaos, a police force looking in the wrong direction: how one nurse fooled the authorities to cause destruction and death by tampering with saline bags at Stockport's Stepping Hill Hospital.

Nurse Jeanine Hannah is employed to help 68-year-old Margaret Bradley, but instead of providing care, she injects her with a lethal dose of insulin. The investigation reveals a chequered history, including aliases and another suspicious death.

In the early 2000s, one of the most trusted nurses in a West Yorkshire hospital is in fact killing her patients on the night shift. The grieving families fight for justice, but then a shocking death changes everything.

Hospital orderly Donald Harvey is seen as a good worker, but when he confesses to multiple murders, no one initially believes him. He goes on to become one of America’s most prolific serial killers.

Nurse Charles Cullen said he hated to see people suffer, but he became the most prolific serial killer in New Jersey history. He confessed to murdering up to forty patients, but some believe there were as many as 300.

Death rate triples on a hospital ward linked to nurse Kristen Gilbert. Could this seemingly typical 'soccer mom' really be a killer?