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What Makes a Murderer
Three convicted murderers submit themselves to a ground-breaking biological and psychological investigation to determine whether they truly had control over their actions, or if hidden factors destined them to kill.
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Cast & Crew See All
Season 1 Episode Guide See All
Episode 1
John Massey
Britain's longest serving murderer, John Massey, submits himself to a ground-breaking biological and psychological investigation to determine whether he truly had control over his actions.
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