Weier, now 15, pleaded guilty to attempted second-degree intentional homicide in a deal with prosecutors in August. But she claimed she was mentally ill during the attack and not responsible for her actions, in a bid to be sent to a mental institution rather than prison. A plea agreement called for her to spend at least three years in a mental hospital if judged mentally ill, and 10 years in prison if not.
Slenderman, a fictional internet character, is a paranormal being who lurks near forests and absorbs, kills or carries off his victims. In some accounts, he targets children. Some renderings show him as a long-limbed, lean man in a black suit, with no face; others with tentacles protruding from his back.
"This sounds crazy, because it is," McMahon said. "This was a real being to this child and she needed to protect those around her. At 12 years old, she had no way to protect herself from (Slenderman) except for Morgan's advice and they swirled down into madness together."