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PEOPLE's latest special edition, True Crime: A Killer in the Family, includes stories about parents, kids, spouses and siblings who turned on their loved ones with deadly consequences

Cases include the Menendez brothers, Scott Peterson, Gabby Petito, and others

“People are fascinated by complex and deviant behavior,” says psychologist Dr. Jerrod Brown, founder and CEO of the American Institute for the Advancement of Forensic Studies. “They want to understand the ‘why’ behind these cases.”

Generations have been taught about stranger danger and the unknown boogeyman lurking in the shadows, waiting to commit the most heinous crimes.

Family members, it turns out, can be just as dangerous.

“For most Americans, regardless of where they live, the risk of being murdered is muc

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