Take a look into the obsessed mind of violent killer, William Matheson who in 2003 brutally murdered his ex-girlfriend, Lyndsay Van Blanken. He strangled the pretty 18-year-old with cable ties before dumping her body in an abandoned storeroom. Clinical psychologist Dr Leah Giarratano tells us what led this loner to turn from obsessed ex boyfriend into a vicious killer.
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