Police investigating Lucy Letby have arrested a hospital executive on suspicion of perverting the course of justice.
Cheshire Constabulary confirmed that officers executed a search warrant at a property as part of Operation Duet, an inquiry examining senior figures at the Countess of Chester Hospital over possible corporate and gross negligence manslaughter.
Letby, 35, originally from Herefordshire, was found guilty of murdering seven babies and attempting to murder seven more while working at the hospital between 2015 and 2016.
In the previous year, three senior leaders were arrested over the rise in infant deaths but were later released without charge.
Police said a property search was carried out on Wednesday, followed by the arrest of a suspect. No further identifying details have been released.
In a statement, officers said: "An individual was arrested on suspicion of perverting the course of justice. They have since been released on bail pending further inquiries."
Letby received 15 whole-life prison terms. However, some experts have since raised concerns about how evidence was presented during her trial.
A panel of international specialists reviewing medical records has argued that the deaths were not the result of deliberate harm, suggesting instead that extreme prematurity and substandard care were contributing factors.
The case is now under review by the Criminal Cases Review Commission (CCRC), which investigates potential wrongful convictions. Authorities, including police and prosecutors, maintain that the original verdict was sound. The CCRC is examining claims that natural causes and inadequate care may explain the babies' deaths and collapses.
Meanwhile, the Thirlwall Inquiry—tasked with determining whether earlier intervention could have prevented the deaths—has again delayed publication of its findings. The report is not expected before the CCRC reaches a decision.
Cheshire Constabulary continues to face criticism over its handling of the investigation.
David Davis, a Conservative MP, told Parliament in March that the inquiry contained "egregious" failings and did not follow established guidance for investigating suspected healthcare serial killers.
He also claimed police failed to involve statistical experts and did not adequately explore alternative explanations, despite evidence that the unit was understaffed, overcrowded, and affected by bacterial outbreaks.
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