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Couples Who Kill 4

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Serial killers are not a new phenomenon, but what happens in the mind of the average person when they fall under the spell of a sadistic predator? Forensic psychologists and criminal profilers uncover horrifying clues and reveal the true stories of people driven by love to commit murder. ‘Couples Who Kill' investigates some of the most terrifying crimes to explore the roots of these deadly duos. Series four includes the case a couple who conspired to murder a fortune teller; an abusive husband and his complicit lover who brutalised his ex-wife and murdered her brother; and a teenage duo who committed the largest mass murder in Arizona history.