Three senior managers who worked at the hospital where Lucy Letby, then a neonatal nurse, was convicted of murdering seven babies have been arrested as part of a police investigation into manslaughter by “gross negligence.”Cheshire Constabulary, the local police force responsible for investigating a series of baby deaths at the Countess of Chester Hospital, said the three people were part of the hospital’s “senior leadership team” between 2015 and 2016. Ms. Letby was convicted in 2023 of murdering seven babies and attempting to murder seven others during that period. Ms. Letby was sentenced to spend the rest of her life in prison. In the arrests of the three senior managers, the police did not name the suspects, in accordance with internal guidelines and British privacy laws. But they said the managers had been arrested on Monday on suspicion of gross negligence manslaughter and had been released on bail as the investigation continued.