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, ...

Morgan Geyser, convicted in the 2014 Slender Man stabbing, was recently granted conditional release from a mental health facility, but officials are now seeking to revoke that decision.

Their Slender Man documentary A Self-Induced Hallucination addresses this feeling directly, using a real-world example of a fictional character that inspires folk belief. Related.

Morgan Geyser, convicted in the 2014 Slender Man stabbing, was recently granted conditional release from a mental health facility, but officials are now seeking to revoke that decision.