Lucy Letby Timeline: 2012 to 2026 Explained

Lucy Letby is serving 15 whole-life prison terms for murdering seven babies and attempting to murder seven others while working as a neonatal nurse at the Countess of Chester Hospital. Two juries convicted her — in August 2023, and again at a retrial in July 2024 — and two applications for permission to appeal have since been refused by the Court of Appeal.

Her case hasn't settled into history the way most closed convictions do. A formal application is under review by the Criminal Cases Review Commission, a panel of international neonatal specialists has publicly said it found no medical evidence of deliberate harm, and a statutory public inquiry into how the hospital handled the case is still sitting. This timeline sets out what happened, in order, from Letby's arrival at the hospital in 2012 through to where the case stands in August 2026.

Throughout, the babies at the centre of the case are referred to by the court-approved letters used to protect their families' privacy — Child A, Child B and so on — in line with reporting restrictions that have applied since the original trial.

2012: A New Nurse Joins the Countess of Chester Neonatal Unit

Lucy Letby, born in Hereford in January 1990, trained as a children's nurse at the University of Chester, qualifying in 2011 after several years on the Countess of Chester's neonatal unit as a student. She began working there as a qualified nurse in January 2012, initially rated by colleagues as a capable, well-liked member of a small, close-knit unit caring for premature and unwell newborns.

January 2015: A Change in the Numbers

For her first three years at the hospital, the neonatal unit's mortality rate was statistically unremarkable compared with similar units elsewhere in the country. That changed from around January 2015 onward, according to evidence given at her trial, with prosecutors later describing a "significant rise" in deaths and "serious, catastrophic collapses" among babies on the ward over the following eighteen months.

June 2015 – June 2016: The Indictment Period

The offences of which Letby was ultimately convicted fall within a thirteen-month window. During this period, seventeen babies on the unit either died or suffered sudden, unexplained collapses, some resulting in lasting disability for the children who survived. The Crown's case, built over a ten-month trial, was that fourteen of those seventeen incidents were the result of deliberate harm. See our full breakdown of the alleged methods for how each count was argued.

Autumn 2015: The First Concerns

Consultant paediatricians at the hospital, including Dr Stephen Brearey and Dr Ravi Jayaram, began raising informal concerns from around October 2015, after noticing Letby appeared to be present for an unusually high proportion of the unit's sudden deteriorations. These concerns were raised with the hospital's nursing director, Alison Kelly, and its medical director, Ian Harvey — but according to evidence given both at trial and later to the public inquiry, the consultants were told there was no direct evidence against Letby and were, in Dr Jayaram's words, put under "a reasonable amount of pressure" from senior management not to make a fuss.

February – July 2016: Delay and Removal

Concerns were raised again in February 2016. A requested urgent meeting with senior executives didn't take place until May 2016 — a three-month delay the statutory Thirlwall Inquiry has since scrutinised in detail — and consultants were reportedly assured Letby's presence at each incident was coincidental. Letby worked her final shift on the neonatal unit on 30 June 2016, before being moved to an administrative role. By the consultants' own later account, this removal came only after further babies had collapsed or died in the months since concerns were first raised.

2017–2020: Operation Hummingbird and Three Arrests

Cheshire Police launched a formal investigation, codenamed Operation Hummingbird, in May 2017. Letby was arrested on suspicion of murder and attempted murder in July 2018 and again in June 2019, released on bail both times. She was arrested a third and final time in November 2020 and formally charged with seven counts of murder and fifteen counts of attempted murder. Read how the investigation was actually built for the full detail on those four years.

October 2022 – August 2023: Trial and Conviction

Letby's trial opened at Manchester Crown Court in October 2022 and ran for close to ten months, becoming one of the longest criminal trials in modern British legal history. On 18 August 2023, the jury returned guilty verdicts on seven counts of murder and seven of attempted murder, acquitted her on two further counts, and couldn't reach a verdict on six remaining counts. She was sentenced on 21 August 2023 to fourteen whole-life orders, becoming only the fourth woman in British legal history to receive one. Full detail on how the trial unfolded is in our piece on the verdict and sentencing.

2024: The Retrial and a Fifteenth Order

Letby's first application for permission to appeal was refused at a full Court of Appeal hearing in May 2024. The following month, she was retried on the single remaining count relating to Child K's attempted murder. The jury returned a guilty verdict on 2 July 2024, and Letby was sentenced on 5 July 2024 to a fifteenth whole-life order. A second application for permission to appeal was refused in October 2024.

2024–2026: A Statutory Inquiry and a Growing Legal Challenge

A statutory public inquiry chaired by Lady Justice Thirlwall opened in September 2024, examining how the hospital and the wider NHS handled the concerns raised about Letby. Its final report, originally expected in late 2025, has been delayed and wasn't expected before September 2026 at the earliest.

Separately, in February 2025, Letby instructed barrister Mark McDonald, who submitted a formal application to the Criminal Cases Review Commission (CCRC) — the independent body that investigates potential miscarriages of justice in England and Wales. That same month, a panel of fourteen international neonatologists and paediatricians, led by Canadian physician Dr Shoo Lee, held a press conference in London stating they'd found no medical evidence of deliberate harm in any of the cases they reviewed. The CCRC's review continued well into 2026, with substantial further expert reports and legal submissions still being received as late as January 2026.

Separately again, Cheshire Police submitted a file to the Crown Prosecution Service in late 2025 concerning new allegations relating to nine further babies. On 30 January 2026, the CPS announced it would not bring further charges. Families involved sought to legally challenge that decision; the CPS confirmed on 6 August 2026 that it was rejecting the challenge.

August 2026: Where the Case Stands

Lucy Letby's convictions remain in place, upheld through two rounds of ordinary appeal. At the same time, her case is the subject of an active CCRC review — a process the commission itself is careful to describe as neither a finding of guilt nor of innocence — alongside a public inquiry whose final conclusions are still pending. Whether that combination eventually produces a referral back to the Court of Appeal, or confirms the safety of the original verdicts, remains genuinely open, nearly three years after the first convictions were returned.

Browse DOUBT: The Case of Lucy Letby →