Countess of Chester Hospital neonatal-unit murders

Lucy Letby, born 4 January 1990 in Hereford, England, is a British former neonatal nurse who worked in the Countess of Chester Hospital's neonatal unit from January 2012. Between June 2015 and June 2016, the unit recorded an unusual cluster of infant collapses and deaths, compared with its usual two or three deaths a year. Letby was charged in November 2020 with seven counts of murder and fifteen counts of attempted murder relating to seventeen infants. In August 2023, a jury at Manchester Crown Court found her guilty of seven counts of murder and seven of attempted murder, acquitted her on two counts, and could not reach verdicts on six others; a 2024 retrial produced a conviction on one further attempted-murder count.

Concerns were first raised internally in 2015 by unit manager Eirian Powell and lead neonatologist Stephen Brearey; the trust initially classified the deaths as medication errors. After further deaths in June 2016, consultants asked management to remove Letby from clinical duties, and she was reassigned to non-clinical duties the following month. A subsequent review by the Royal College of Paediatrics and Child Health found no definitive explanation for the elevated mortality rate. Consultants, including Brearey and Ravi Jayaram, later contacted Cheshire Constabulary, and the hospital publicly confirmed police involvement in May 2017 as Operation Hummingbird. Letby was arrested in July 2018 and charged in November 2020.

At trial, prosecutors cited Letby's presence during the incidents, two blood test results interpreted as evidence of insulin poisoning, skin discolouration said to indicate air embolism, alleged irregularities in medical records, nursing handover sheets found at her home, and handwritten notes — including "I killed them on purpose because I'm not good enough to care for them," alongside others stating "I haven't done anything wrong" — which prosecutors characterised as a partial confession and the defence attributed to emotional distress. Letby denied all charges, testifying that staffing and care problems, not deliberate harm, explained the collapses; her only other defence witness was a plumber who described recurring plumbing problems. On 21 August 2023 she was sentenced to a whole life order, and a fifteenth such order followed her 2024 retrial conviction; she was struck off the nursing register in December 2023.

The Court of Appeal refused permission to appeal her original convictions in May 2024 and her retrial conviction in October 2024. A UK government inquiry chaired by Lady Justice Thirlwall was upgraded to a statutory inquiry in August 2023 and began public hearings in September 2024; as of April 2026 its report remained unpublished. Police continued investigating other cases at the Countess of Chester Hospital and Liverpool Women's Hospital, where Letby had also worked, but the Crown Prosecution Service announced on 20 January 2026 that no further charges would be brought. Three former senior hospital leaders were arrested on suspicion of gross negligence manslaughter in July 2025, and inquests into five of the infants' deaths opened in February 2026.

Since reporting restrictions lifted, several medical, statistical and scientific experts have questioned the trial evidence. In February 2025, a panel of fourteen international medical experts convened by neonatologist Shoo Lee found the deaths and collapses consistent with natural causes or substandard care, with no evidence of deliberate harm; her legal team applied to the Criminal Cases Review Commission the same day. Statistician Jane Hutton and others have separately criticised the shift-pattern data presented to the jury. The prosecution's lead expert witness, Dewi Evans, has rejected these criticisms. The Court of Appeal has rejected every challenge brought to date, and the Criminal Cases Review Commission's review remained pending.