Joni Johnston, PsyD, is a clinical/forensic psychologist, private investigator, and true crime writer. In addition to writing The Human Equation blog for Psychology Today, she is the host of a podcast, Behind the Mask, as well as a YouTube channel (Unmasking a Murderer).
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Learn the terrifying truth behind the world's deadliest serial killers . . . Serial killers haunt our dreams and inspire the terrifying villains of TV shows and horror movies. But how much do you really know about the minds behind the world's deadl... SEE MORE