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, 10 times the correct amount, to a newborn baby two years before she murdered her first victim, an inquiry has heard. The baby received 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.

The mistake was spotted quickly and the baby suffered no ill-effects, the inquiry heard. Ms Farmer said Letby was not far into her nursing career at the time, but was outside the