Who is Slenderman and how did he influence Morgan Geyser in the Slender Man case?

Slenderman is described as a tall, faceless fictional character who preys on children. In the infamous Slender Man case, he exerted a powerful psychological influence over Morgan Geyser, one of the two 12-year-old girls involved in the stabbing incident. According to the defense evaluator in the case, Morgan wasn't deviously planning the attack but rather felt controlled by Slenderman. This suggests that her actions were driven by delusions rather than malicious intent, highlighting the complex mental health issues at play. This case demonstrates how fictional internet mythology can dangerously impact vulnerable young minds.