Slender Man is a modern myth that was created in June 2009, by Eric Knudsen, as part of an online paranormal image competition. He submitted two images of what looked like children being followed by a tall, thin man, with a black suit and tentacle-like arms. The creature’s unnerving appearance made its way into creepy pastas and a video game adaptation called, “Slender: The Eight Pages.”
In Wisconsin 2014, a slumber party among three friends ended in the stabbing of one of the girls. Morgan and Anissa lured their friend, Payton, into the woods where Morgan would stab Payton 19 times and leave her to die in the name of child stalker, Slender Man.
https://en.wikipedia.org/wiki/Slender_Man_stabbing
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