Panorama: Lucy Letby: The Nurse Who Killed

Lucy Letby has been convicted of murdering and harming babies, so what turned a likeable nurse into a serial killer? For the first time, Panorama hears from a family whose child died, a friend who's stood by her and a doctor who tried to raise the alarm. Reporter Judith Moritz reveals evidence of a cover-up by hospital bosses and asks whether some babies' lives could have been saved