In a hospital ward where the most vulnerable infants were fighting for their lives, a predator was hiding in plain sight. For months, doctors were baffled by a spike in unexplained deaths, never suspecting the nurse who was always present during the tragedies. This video examines the investigation into Lucy Letby and the moment the case shifted from a medical mystery to a criminal trial. We look at the chilling piece of evidence discovered during a police search—a handwritten note that served as a confession of guilt. Learn how investigators pieced together the timeline of care and why the evidence found in her home was the final nail in the coffin. If you find cases involving trusted figures fascinating, this investigation is a must-watch.

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