A day later , according to Know Your Meme , Knudsen added a third photo and a fictional doctor 's account of a mass killing . `` Slenderman '' character allegedly inspired 12-year-old girls to stab a classmate . Slenderman was born in 2009 in an online forum for people who create fake supernatural images . He 's appeared in fan art , short stories , videos , video games on Web . Police : The girl stabbed the boy with a knife and he died of his injuries later that day.
`` Slenderman '' character allegedly inspired 12-year-old girls to stab a classmate . Slenderman was born in 2009 in an online forum for people who create fake supernatural images . He 's appeared in fan art , short stories , videos , video games on Web . Police : The girl stabbed the boy with a knife and he died of his injuries later that day.