Colin Norris

Norris is believed to have been inspired by Jessie McTavish, a fellow Scottish nurse who was convicted of murdering a patient with insulin in 1974 before having her conviction quashed in 1975.

The incident had happened at Ruchill Hospital in Glasgow, less than a mile from where Norris grew up.

Shortly before he qualified as a nurse he had learned about McTavish.

Norris was born and brought up in the Milton area of Glasgow, Scotland.

He originally worked as a travel agent after leaving college, but after a few years in this role decided to retrain as a nurse.

Friends described him as someone who loved being centre stage, and said he enjoyed amateur dramatics.

His academic record was average, but he became known for being quick to anger and his aggressive confrontations with tutors and, later, employers.

His behaviour towards university lecturers at the University of Dundee was described as "unacceptable".

He constantly argued with his tutor, and he later said of her: "my tutor and I didn't exactly see eye to eye. I had a personality clash, basically 'cos I had one and she never, and she was my personal tutor."

Shortly before he qualified, this tutor was known to have taught Norris about Jessie McTavish, a nurse convicted of murdering a patient with insulin at Ruchill Hospital in Glasgow, less than a mile from where Norris grew up.

McTavish's conviction was overturned on appeal.

Norris was tasked with "reviewing" her conduct by his tutor.

Learning about McTavish would later be regarded as a likely inspiration for Norris, and he would have learned at this point that insulin is the perfect weapon for murder because it leaves the blood very quickly.

Colin Campbell Norris (born 12 February 1976) is a Scottish serial killer and former nurse convicted for the murder of four elderly patients and attempted to murder another in two hospitals in Leeds, England in 2002.

Norris, who self-admittedly disliked elderly patients and had previously stolen hospital drugs, was the only person on duty when all the five patients inexplicably fell into sudden hypoglycaemic comas, despite the non-diabetic women only being in minor injury wards with merely broken hips.

Suspicions were raised when Norris predicted that healthy Ethel Hall would die at 5:15 am one night, which is when she fell into a catastrophic arrest, and tests revealed that she had been injected with an extremely high level of man-made insulin.

Insulin was missing from the hospital fridge and Norris had last accessed it, only half an hour before Hall fell unconscious.

Subsequent investigations would find that the unnatural hypoglycaemic attacks followed him when he was transferred to a second hospital, and hospital records revealed that only he could not be eliminated as a suspect.

Detectives believed that Norris was responsible for up to six other suspicious deaths where only he was always present, but a lack of post mortem evidence and other factors meant that investigators and the Crown Prosecution Service could not pursue convictions for these deaths.

The murder inquiry was led by Chris Gregg and the investigation was praised for its thoroughness.

Doubts were later raised about his conviction by, among others, Professor Vincent Marks, an expert on insulin poisoning, who concluded from his own studies that there was a 1 in 10 chance that each patient's arrest could have happened naturally.

However, others have pointed out that C-peptides are produced in hypoglycaemic attacks caused by insulin produced naturally in the body, and these were not detected in any of the blood tests of the victims, indicating that the insulin had been introduced to their bodies externally and artificially.

Norris began working in Leeds after qualifying in June 2001, but quickly fell out with experienced authority figures, finding it difficult to be told no or what to do.

Colleagues recounted him saying that he didn't like working on minor injury wards or with old people and wanted to work in the emergency department because it was more 'exciting' for him.

He said he "wasn't put on this earth to sit in an office."

The hospital later found out that he had been secretly working as a nurse in other hospitals on occasions when he claimed to be off sick or attending a training course.

His former partner said after his conviction that Norris had once hit him during an argument, bruising his head and once threw a bottle at him, which caused him to break up with him.

He also said that, around the time of the murders, Norris had become engrossed by a storyline in Holby City, in which a serial killer nurse played by Rachel Leskovac killed patients with insulin before eventually being uncovered as a murderer.

This same storyline is believed to have inspired another UK nurse, Benjamin Geen, to kill his patients.

In the month in which he began killing patients with overdoses, Geen appeared in an edition of the Banbury Citizen which featured an interview with Leskovac.

Norris's partner would also reveal after Norris's conviction that Norris had experimented on his cat Casper before he began killing patients, injecting it with a lethal dose of insulin and killing it.

The partner had reported him to the police but Norris claimed the cat had died as it hit its head on a wall.

As a trainee nurse Norris often refused to work with elderly patients, saying he "didn't want to be working with that type of person".

He admitted to police he found elderly patients challenging.

Police would later discover that Norris had repeatedly mistreated elderly patients in the early months of his nursing career at the same Leeds hospitals in which he would later go on to murder patients.

In one instance, an elderly man asked Norris to empty his catheter bag, only for Norris to flatly refuse and insist he do it himself, before going off duty.

The elderly man then collapsed after trying to reach the bathroom by himself.

Other patients stated that Norris had treated them in an offhand and callous manner, and that Norris had an apparent dislike of old people.

Norris lost an appeal against his conviction in 2009.

In February 2021 the Criminal Cases Review Commission referred the case back to the Court of Appeal.