The Lucy Letby Trial (2022-2023): Verdicts and Ongoing Review

Case at a Glance

The Lucy Letby Trial: The Complete Case Brief

The Lucy Letby trial was the 2022-2023 criminal proceeding at Manchester Crown Court in which former neonatal nurse Lucy Letby was convicted of murdering seven infants and attempting to murder six others at the Countess of Chester Hospital in northwest England. Letby, who worked in the hospital's neonatal unit, was accused of deliberately harming premature and vulnerable babies through methods including air injection, insulin poisoning, and force-feeding, between June 2015 and June 2016. She received a whole-life prison order, but her case has since become the subject of significant controversy, with an international panel of medical experts challenging the evidence used to convict her. The case is commonly searched as lucy letby, lucy letby trial, or lucy letby verdict.

Who Is Lucy Letby?

Lucy Letby, born in Hereford, England, on January 4, 1990, worked as a neonatal nurse in the neonatal unit at the Countess of Chester Hospital in Chester, northwest England. Before the events that led to her prosecution, doctors at the hospital began to notice a troubling and unexplained rise in the number of infant deaths and sudden, unexpected collapses on the unit. Before June 2015, the neonatal unit had recorded fewer than three baby deaths per year; the number rose sharply during the period covered by the charges against Letby.

The Charges

Letby faced 22 charges in total, accusing her of secretly attacking 13 babies on the neonatal ward between June 2015 and June 2016. Prosecutors alleged she used a range of methods to deliberately harm the infants, including injecting air into their bloodstreams to cause fatal air embolisms, administering air or excess milk into their stomachs through nasogastric feeding tubes, and, in at least two cases, poisoning infants with insulin.

A key element of the prosecution's case was that Letby was the only staff member present on the ward during every incident under investigation, while no other nursing staff shared that pattern of presence. Investigators also presented handwritten notes recovered from Letby's home, in which she had written phrases including that she 'killed them on purpose,' alongside other notes in which she claimed she had 'done nothing wrong,' evidence the prosecution argued reflected a private admission of guilt.

The Trial

Letby's original trial began in October 2022 at Manchester Crown Court and lasted approximately ten months, making it one of the longest criminal trials in British legal history. Prosecutor Nicholas Johnson KC characterized Letby to the jury as a 'calculating and devious' opportunist who had 'gaslighted' her colleagues while carrying out what he described as her 'murderous assaults' on some of the hospital's most vulnerable patients.

Letby testified in her own defense, denying that she had ever harmed any of the babies in her care and maintaining her innocence throughout the proceedings. After more than three weeks of jury deliberations, spanning roughly 76 hours in total, the jury began returning its verdicts in stages during August 2023.

The Verdict

On August 8, 2023, the jury returned its first set of guilty verdicts, and Letby broke down in tears as they were read. Further verdicts followed on August 11 and in the days that followed, though reporting restrictions meant the verdicts could not be made public until the jury had been fully discharged.

On August 18, 2023, it was publicly confirmed that the jury had found Letby guilty of murdering seven babies and of six counts of attempted murder relating to six other infants, making her, according to widespread media reporting at the time, the United Kingdom's most prolific convicted killer of babies in modern history. Letby was found not guilty on two further counts of attempted murder, and the jury was unable to reach a verdict on six additional attempted murder charges relating to one further baby, referred to in proceedings as Baby K.

The Sentencing

On August 21, 2023, Judge James Goss sentenced Letby to a whole-life order, the most severe sentence available under British law, which does not include the death penalty. A whole-life order means Letby will never be eligible for parole or release under any circumstances. In sentencing her, the judge stated that Letby had acted with 'malevolence bordering on sadism.' At the time of her sentencing, only three other women in the United Kingdom had ever received a whole-life order.

The Retrial on the Remaining Count

Because the jury had been unable to reach a verdict on the six remaining attempted murder charges relating to Baby K, prosecutors sought a retrial on one of those counts. Following a four-week retrial, a new jury at Manchester Crown Court found Letby guilty of the attempted murder of Baby K, a baby girl born at just 25 weeks' gestation on February 17, 2016, whose breathing tube prosecutors alleged Letby had deliberately dislodged on multiple occasions. This additional conviction was confirmed in 2024, and Letby was ultimately given a total of 15 whole-life prison terms across both trials.

The Ongoing Challenge to Letby's Convictions

Since her convictions, Lucy Letby's case has become the subject of an unusually significant and sustained challenge from independent medical and statistical experts, distinguishing it from most concluded criminal cases.

In February 2025, an international panel of 14 neonatal and pediatric specialists, convened and chaired by retired Canadian neonatologist Dr. Shoo Lee, presented findings disputing the medical evidence used to convict Letby. The panel concluded that it had found no medical evidence supporting the claim that any of the babies had been deliberately harmed, arguing instead that the deaths and collapses were attributable to natural causes or, in some instances, substandard medical care at the hospital. Notably, Dr. Lee had co-authored a 1989 academic study on air embolism in infants that prosecutors relied on at trial; Lee has since said his research was misinterpreted by the prosecution's own expert witness, Dr. Dewi Evans.

Separately, statisticians have also challenged a key piece of evidence presented at trial: a chart showing that Letby was on duty during every incident under investigation, while no other staff member shared that same pattern. Some statisticians, including Professor Jane Hutton of the University of Warwick, have argued this approach to presenting the evidence involved significant methodological flaws, with the Royal Statistical Society itself expressing concern about the safety of the conviction.

Letby's legal team, led by barrister Mark McDonald, has submitted more than a thousand pages of new expert material to the Criminal Cases Review Commission (CCRC), the independent body responsible for investigating potential miscarriages of justice in England and Wales. The CCRC, which does not itself determine guilt or innocence but decides only whether a case should be referred back to the Court of Appeal, confirmed it was conducting an active review of Letby's case. The Court of Appeal had already declined two earlier challenges to her convictions, including a refusal to admit fresh evidence from Dr. Lee's research on the grounds that it did not meet the legal standard required for new evidence at that stage.

A separate public inquiry, the Thirlwall Inquiry, has been examining the broader circumstances at the Countess of Chester Hospital since September 2023, proceeding on the basis that Letby is guilty, though it has no legal authority to overturn or affirm her convictions and has been delayed until at least September 2026.

Why the Lucy Letby Trial Matters

The Lucy Letby trial is significant both as one of the most serious cases of alleged medical harm to children in recent British history and, increasingly, as a case study in the challenges of proving guilt through circumstantial, statistical, and expert medical evidence in the absence of direct eyewitness testimony.

Key reasons the case remains important and closely watched:

• It resulted in one of the most severe sentences available under British law, with Letby receiving 15 whole-life terms across her original trial and subsequent retrial.
• It has become a significant test case for how the Criminal Cases Review Commission evaluates large-scale expert challenges to a conviction, given the scale and coordination of the medical panel's findings.
• It has raised broader questions about the use of statistical evidence in criminal trials, particularly in cases involving clusters of unexplained deaths in healthcare settings.
• It prompted a formal government-ordered public inquiry, the Thirlwall Inquiry, into hospital governance and how concerns raised by senior clinicians were handled before Letby's removal from clinical duties.
• It remains legally unresolved in an unusual way, since Letby's convictions stand as a matter of law while an active CCRC review considers whether a fresh appeal should be granted.

Key Facts at a Glance

Frequently Asked Questions

Who is Lucy Letby?

Lucy Letby is a former British neonatal nurse convicted in 2023 of murdering seven babies and attempting to murder several others at the Countess of Chester Hospital.

What was Lucy Letby convicted of?

Letby was convicted of seven counts of murder and seven counts of attempted murder, across her original 2023 trial and a 2024 retrial on one remaining count.

What sentence did Lucy Letby receive?

Lucy Letby received a whole-life order, the most severe sentence under British law, meaning she will never be eligible for release.

When was the Lucy Letby verdict delivered?

The jury's verdicts were publicly confirmed on August 18, 2023, after deliberations that had taken place over the preceding weeks.

Where did Lucy Letby work?

Lucy Letby worked as a neonatal nurse at the Countess of Chester Hospital in Chester, England.

How many babies did Lucy Letby harm?

Letby was accused of secretly attacking 13 babies in total, resulting in seven murder convictions and seven attempted murder convictions.

Is Lucy Letby appealing her convictions?

Yes, Letby's legal team has submitted an application to the Criminal Cases Review Commission, which is actively reviewing new expert evidence that challenges her convictions.

What new evidence has emerged in the Lucy Letby case?

In February 2025, an international panel of 14 medical experts concluded there was no medical evidence supporting the murder convictions, arguing the deaths had alternative, natural explanations.

Who is Dr. Shoo Lee, and why is he significant to the Lucy Letby case?

Dr. Shoo Lee is a retired Canadian neonatologist whose 1989 research on air embolism was used by prosecutors at Letby's trial; he has since said his findings were misinterpreted and has led the panel challenging her convictions.

Has the Court of Appeal overturned Lucy Letby's convictions?

No, the Court of Appeal has rejected two earlier challenges to her convictions, though the Criminal Cases Review Commission's current review remains ongoing.

What is the Criminal Cases Review Commission?

The Criminal Cases Review Commission is an independent body in England and Wales that investigates potential miscarriages of justice and can refer cases back to the Court of Appeal.

What is the Thirlwall Inquiry?

The Thirlwall Inquiry is a separate public inquiry examining events and hospital governance at the Countess of Chester Hospital, operating on the premise that Letby is guilty, though it has no authority over her legal case.

How long did the original Lucy Letby trial last?

Letby's original trial lasted approximately ten months, running from October 2022 to August 2023, making it one of the longest criminal trials in British history.

What methods was Lucy Letby accused of using to harm the babies?

Prosecutors alleged she injected air into the infants' bloodstreams, administered excess air or milk through feeding tubes, and poisoned at least two babies with insulin.

Why is the Lucy Letby case still controversial?

The case remains controversial because a substantial panel of independent medical and statistical experts has publicly disputed the evidence used to convict her, prompting an active review by the Criminal Cases Review Commission even though her convictions currently stand.

Final Takeaway

The Lucy Letby trial resulted in one of the most severe sentences in modern British legal history, with Letby convicted of murdering seven babies and attempting to murder several others at the Countess of Chester Hospital, and sentenced to a whole-life order across her original trial and 2024 retrial. In the years since her conviction, an unusually significant international panel of medical and statistical experts has publicly challenged the evidence underpinning her case, prompting an active review by the Criminal Cases Review Commission, meaning that while Letby's convictions remain legally in force, the broader question of whether they will ultimately stand remains genuinely unresolved.