Thirlwall Inquiry Exposes 'Complete Failure' in Hospital's Protection of Babies from Serial Killer Nurse

The public inquiry into how Lucy Letby murdered babies at the Countess of Chester hospital has concluded that the institution failed fundamentally to protect the infants in its care. After six months of hearings involving more than 130 witnesses and 400 statements, Lady Justice Thirlwall published her findings in September 2026—a report spanning more than 1,100 pages across three volumes. The inquiry's core finding was unsparing: there existed a "complete failure to protect babies on the neonatal unit" where Letby, now 36, murdered seven babies and attempted to murder seven others, one of them twice.

The hospital had multiple opportunities to stop the killings but did not. In June 2015, three babies died within two weeks—a cluster that represented the entire annual death toll for the unit, yet no one connected these deaths or treated them as a warning. When a fourth baby died in August 2015, the incident was reviewed but handled as a formality. By that month, the death toll had reached four—the highest since 2008. The inquiry found that had a doctor identified as Dr ZA not disregarded an insulin test result for one baby in August 2015, safeguarding action would have been triggered. That single intervention would have prevented attacks on eight more babies and the deaths of three others. Similarly, if safeguarding measures had been implemented by October 2015, after the death of another infant, two more deaths would have been prevented along with multiple attacks. In February 2016, Dr Ravi Jayaram witnessed concerning behavior but did not report it. In May 2016, executives met without raising safeguarding concerns—a failure that would have stopped two further deaths.

Hospital leadership actively obstructed the investigation and suppressed concerns. Medical director Ian Harvey "sought to control the narrative," curating which documents investigators would see and writing new ones to support his preferred account. Chief executive Tony Chambers took a dictatorial approach to consultants and presented board updates as exercises in public relations spin. His actions delayed police involvement by nearly a year. Director of nursing Alison Kelly, who held responsibility for safeguarding, knew she was obligated to act when a baby might have been deliberately harmed, yet she did not. Unit manager Eirian Powell's judgment was clouded by the belief that Letby was an excellent nurse. Karen Rees, director of nursing for urgent care, had "lost all judgement" and adopted a hostile stance. Thirlwall found the behavior of hospital executives to be "high-handed, against all safeguarding principles, and foolhardy." They repeatedly failed in their duty of candour toward parents, investigators, and regulators.

The parents of the babies were treated what Thirlwall described as "reprehensibly." They were kept in the dark for years about evidence that their children may have been deliberately harmed. Hospital executives used the potential distress to parents as a convenient justification for not calling police. Doctors who raised concerns were not protected by the hospital's whistleblowing policy and faced pressure to leave—senior managers suggested some might be referred to the General Medical Council. The inquiry found that the framing of the crisis as "nurses against doctors" was fundamentally wrong; the question should have been only about keeping babies safe.

When Letby filed a grievance in 2017 after being moved from her normal duties, the hospital's handling was "deplorable." The investigating officer lacked independence and objectivity. Alison Kelly and Ian Harvey provided testimony that was "factually inaccurate and misleading." Annette Weatherly, chair of the governance panel, was "unfair in her approach" and had initially dismissed the allegations against Letby as a "witch hunt." Police were eventually called in 2017. The inquiry noted that Letby had ignored management instructions when she disagreed with them, falsified records, and was found to have left an infant covered in their own faeces. She was repeatedly untruthful with colleagues and was noted by patients to have been "inappropriate" and "callous."

Thirlwall identified systemic failures beyond the hospital itself. The Care Quality Commission inspected the Countess of Chester in February 2016 but Letby continued attacking babies until June. Key information was withheld from the regulator, which was also criticized for not pressing harder to look beyond what it was told, despite having been warned by a previous inquiry into deaths at Morecambe Bay NHS Trust to take a tougher approach. Across the NHS more broadly, Thirlwall found a "toxic negativity" that discouraged staff from speaking out, even as efforts had been made over the previous decade to strengthen whistleblower protections. Management across the health service remained preoccupied with avoiding blame and protecting reputation.

The inquiry made 17 recommendations. Neonatal units should install baby monitors on cots and incubators. Access to insulin—which Letby was convicted of administering to two of the babies she killed—should be controlled through biometric data or CCTV monitoring. A new "suspicion of deliberate harm" policy should be created, outlining the steps managers must take when concerns arise. NHS staff should be contractually obligated to follow this policy and other safeguarding guidance. The recommendations point toward a system designed to catch what the current one missed: the moment when suspicion should trigger action, before certainty is required.