Lucy Letby's been accused at her murder trial of "gaslighting" hospital colleagues by claiming a rise in baby collapses was "just a run of bad luck".
The 33-year-old nurse from Hereford denies murdering seven children and attempting to kill another 10 at a neonatal unit in Chester.
In a closing speech to jurors, the prosecution claimed she'd been "calculated and devious" and convinced staff the deaths were not "utterly abnormal".