Lucy Letby gave a potentially fatal dose of morphine to a newborn two years before babies began dying unexpectedly at the Countess of Chester Hospital, the Thirlwall Inquiry has heard.

Lucy Letby's exchanges with fellow nurses and doctors at the Countess of Chester Hospital during her year-long killing spree have been exposed in the Thirlwall Inquiry

Lucy Letby gave a potentially fatal dose of morphine to a newborn baby two years before she murdered her first victim, an inquiry has heard.The infant received 10 times the correct amount of the painkiller at the end of a night shift in July 2013 and could have died if colleagues at handover had not spotted the error an hour later.

Lucy Letby gave a baby 10 times the prescribed dose of morphine "in error" two years before her killing spree began, a public inquiry has heard. The nurse was then unhappy at being told she could no longer administer controlled drugs at the Countess of Chester Hospital after the incident in July 2013.