New Questions Emerge in "Killer Nurse" Colin Norris Case, Prompting Podcast Investigation

A new BBC podcast series is raising questions about the conviction of Colin Norris, a former nurse serving a life sentence for the murders of four elderly patients. The podcast suggests that the events leading to his 2007 conviction for murder might have been a result of a medical mix-up rather than deliberate poisoning.

Norris, originally from Glasgow, was convicted of murdering four patients and attempting to murder a fifth between 2002 and 2003 at Leeds General Infirmary. The case gained prominence following the conviction of neonatal nurse Lucy Letby for murdering seven babies and attempting to murder seven others, though the circumstances of the two cases are distinct.

The Original Case

The case against Norris began in 2002 when 86-year-old patient Ethel Hall was found in a hypoglycemic coma. Blood tests at the time indicated a high level of insulin in her system, leading to a murder investigation. A colleague reported that Norris had predicted Hall might not survive the night, making him an early suspect. Police later reviewed other deaths on Norris's wards, identifying three more unexplained hypoglycemic deaths and one case of recovery. Experts for the prosecution argued that severe hypoglycemia in non-diabetic patients was rare and indicated murder, despite the absence of blood tests at the time of death for these other patients.

During his trial in 2007, defense experts suggested that four of the five patients had died of natural causes. However, after a five-month trial, Norris was convicted by an 11-1 majority verdict and sentenced to a minimum of 30 years before parole eligibility.

Challenges to the Conviction

Norris's case began to be re-examined in 2009, after his first appeal was dismissed. In 2011, new scientific evidence emerged suggesting that hypoglycemia in the elderly was not as rare as previously believed, potentially misinforming the jury. This evidence was submitted for a second appeal, which took 14 years to be heard.

During the appeal hearing last year, Norris's experts argued that the patients' symptoms could have occurred naturally in frail, elderly individuals. The Crown's experts maintained that the deaths were medically distinct, citing that the patients' blood sugar readings remained low despite glucose treatment, a characteristic they argued was indicative of deliberate insulin poisoning rather than naturally occurring hypoglycemia, which can be corrected more easily.

Alternative Scenarios Explored

The BBC podcast investigates the possibility of accidental syringe swaps. An endocrinologist consulted for the podcast stated that if a patient received dextrose instead of insulin, the amount given would not typically cause a severe coma. He suggested that while the error might mask insulin detection in a blood test, the insulin levels would still register as high, depending on the timing of the sample. He also noted that accidentally administering too much sugar does not cause a coma and takes much longer to manifest if it causes any severe symptoms at all.

Further investigation has revealed that all five patients had been prescribed various medications, including antibiotics, and two were on potent painkillers, all of which are known to increase the risk of severe hypoglycemia in frail, elderly patients. The podcast posits that a strong opioid prescribed to Ethel Hall for pain relief could have caused her coma, and that insulin intended for another patient may have been administered to her before the critical blood sample was taken.

Legal Appeals

Last year, the Court of Appeal ruled on the possibility of naturally occurring hypoglycemia explaining the collapses of the four patients beyond Ethel Hall. However, the court found that the case presented by Norris's legal team did not sufficiently undermine the safety of his convictions and rejected the appeal on all grounds. Attempts to take the case to the Supreme Court were also denied. Norris's lawyers have since lodged an application with the European Court of Human Rights, a process that solicitor Rory Hearty anticipates will take many years.