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There's a thin line between those who kill and those who don't. Journey into killers' minds as they reveal why and how they crossed to the other side. S1, Ep1 Ice Cold: Levi King When 23-year-old Levi King executed two innocent neighbors in 2005 he finally found a release for his life-long inner rage. For the first time in his life, King felt a sense of peace. S1, Ep2 Mad Maks...