Three members of the senior leadership team at the hospital where Lucy Letby used to work have been arrested.
The three, who were in leadership roles at the Countess of Chester Hospital in 20015 and 2016 but have not been named, were arrested on suspicion of gross negligence manslaughter.
Letby, 35, was found guilty of murdering seven children and attempting to murder seven more between June 2015 and June 2016 while working in the neonatal unit of the Chester hospital.
All three have subsequently been bailed pending further enquiries, a statement from Cheshire Police said.
Detective Superintendent Paul Hughes, Senior Investigating Officer for Operation Duet, said: “In October 2023 following the lengthy trial and subsequent conviction of Lucy Letby, Cheshire Constabulary launched an investigation into corporate manslaughter at the Countess of Chester Hospital.
“This focuses on senior leadership and their decision making to determine whether any criminality has taken place concerning the response to the increased levels of fatalities.
“In March 2025 the scope of the investigation widened to also include gross negligence manslaughter.
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“This is a separate offence to corporate manslaughter and focuses on the grossly negligent action or inaction of individuals.
“It is important to note that this does not impact on the convictions of Lucy Letby for multiple offences of murder and attempted murder.
“As part of our ongoing enquiries, on Monday 30th June three individuals who were part of the senior leadership team at the CoCH in 2015-2016, were arrested on suspicion of gross negligence manslaughter.
“All three have subsequently been bailed pending further enquiries.
“Both the corporate manslaughter and gross negligence manslaughter elements of the investigation are continuing and there are no set timescales for these.
“Our investigation into the deaths and non-fatal collapses of babies at the neo-natal units of both the Countess of Chester Hospital and the Liverpool Women’s Hospital between the period of 2012 to 2016 is also ongoing.”
