Police are called to a shooting in the town of Wenham, Massachusetts. Mother of three, Karen Sharpe dies later that night. But who would want to kill her? Investigators soon uncover Karen is in the midst of a multi-million dollar divorce.

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.

A modus operandi that mimics natural death works to the advantage of a north Texas serial killer who preys on elderly victims. His murderous death toll is suspected of having amounted to 22 before a sinister clue leads to his capture.

When an elderly care home resident is discovered dead, staff members sense that something is amiss. A murder investigation begins into a nurse at the home, but when she becomes a victim of violent attacks, could someone else be responsible?

When a resident dies at a care home in Albany, Western Australia, it's assumed she passed away peacefully. But an autopsy reveals horrific injuries. In the frame is carer Jacob Hoysted, but can this quiet, young man really be a brutal murderer?

At Delmenhorst Hospital, Germany, administrators notice death rates in their intensive care unit have risen sharply. Suspicions fall on nurse Niels Hogel, who turns out to be Germany's most prolific murderer since WWII.

The suicide of a Maryland beauty queen leaves her loved ones in shock. But when her sister turns detective, she finds evidence that suggests Sara has not died by her own hand. Detectives set about proving who is guilty of her murder.

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.

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

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.

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.

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.