A spokesperson for the force said: “The Crown Prosecution Service has authorised Cheshire Police to charge a healthcare professional with murder in connection with an ongoing investigation into a number of baby deaths at the Countess of Chester Hospital.”
Letby was arrested by police in 2018 and 2019 but was bailed pending further inquiries.
Following her previous arrests, her home in the Blacon area of Chester was searched by police.
In a 2013 interview with the Chester and District Standard newspaper, the nurse said she cared for babies requiring various levels of support.
She had worked at the unit as a student nurse during three years of training before qualifying as a children’s nurse at the University of Chester in 2011.
Letby said she started working at the unit after graduating.