Slender Man Insanity

The second girl accused of attempting to murder a classmate, because she was commanded by fictional internet horror character Slender Man, has used insanity to enter a plea of not-guilty.
14-year-old Anissa Weier from Waukesha, Wisconsin, originally pleaded not-guilty when she was facing first-degree attempted intentional homicide after attacking a classmate in May of 2014.

Girl in Slender Man stabbing enters plea for insanity