Serial Killers By the Numbers: 11 Facts About the Darkest Side of Humanity

May the odds be in your favor.

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Ever wonder what triggers a person to kill without the slightest hint of guilt? Investigation Discovery dives into the unstable psyche of the world’s most dangerous criminals in the special-edition 100-page publication Serial Killers. From John Wayne Gacy, Jr. to the Zodiac Killer, as well as a few less notorious (but no less deadly) killers throughout the ages, this special issue features expert psychological profiles and analysis delivered by Candice DeLong and Michelle Ward in the way only Investigation Discovery can.