Serial killers usually take a "souvenir" from the scene of the crime-whether it's Polaroid pictures of the body, shoes, or locks of hair. This ritual often leaves a trail of evidence, and ends up being their own undoing.
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50 Facts about Serial Killers and Psychopaths
RandomJust a list I took from the internet cuz I figured maybe a lot of people don't use the internet very often so yeah. ( Credits : the internet )
