The girl survived and is now back in school. These photos of 'Slender Man' stabbing suspect Morgan Geyser's Barbies were shown in Waukesha County Court on Feb. 17, 2015.

Morgan Geyser, then 12 and now 22, stabbed classmate Payton Leutner believing this would please Slender Man, a horrific entity conceived by Eric Knudson in 2009. After seven years in mental care ...

Slender Man is also more common than some people realize, Peck said. “I wouldn’t say it’s as popular as LOLcats, but it’s fairly well known,” he said, citing another famous meme.

Slender Man was created online by Eric Knudson in 2009 as a mysterious specter photo-edited into everyday images of children at play. He's typically depicted as a slim, spidery figure in a black ...