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The Mary Bell Case (1998)

… in December 1968, Mary Flora Bell was convicted of the manslaughter of two boys, Martin Brown (aged four) and Brian Howe (aged three)… Bell was 10 years old when she killed Brown and 11 when she killed Howe, making her one of Britain’s most notorious and youngest child killers….
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Killer Kids: Psychopath Killers (2012)

… examines the cases of 3 young killers: Mary Bell, the 11 year old double murderer; Guy Georges Rampillon, who in childhood exhibited all the signs that would later lead to his serial killer lifestyle and Peter Woodcock, the Canadian teenager that was convicted of 3 grizzly child murders in the 1950’s…

