Sir Trevor McDonald looks back case of nurse Beverley Allitt, who killed four children and attacked another nine in a hospital in 1991.
McDonald comes across never-seen evidence concerning the case and learns about how Allitt almost got away with what she did. There are also recordings of police interviews, and interviews with victims as McDonald tries to understand her motives.
Trevor McDonald and the Killer Nurse is on ITV at 21.00.
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