The 2014 case, which shocked the nation, occurred when Anissa Weier conspired with friend Morgan Geyser to lure Payton Leutner into a wooded area of a Milwaukee park where Leutner was stabbed 19 times, apparently in the name of fictional horror character Slender Man.
The ruling means Weier will go to a mental hospital instead of prison. He's convinced she legitimately believed that she and her family were in danger from Slender Man.
The prosecutor in the case declined comment, as did the family of the girl who was stabbed.
Jurors determined Anissa Weier was mentally ill during the stabbing in 2014.
At 12 years old, she had no way to protect herself from (Slender Man) except for Morgan's advice and they swirled down into madness together'. McMahon said before the inconsistent verdict came in Weier "was shaking so hard, she was shaking me". The girls were allegedly trying to please the fictional internet bogeyman Slenderman. Westendorf testified at Weier's mental capacity trial that she believes Weier suffered from a shared delusional disorder that left her unable to conform her conduct to the law when she and Morgan Geyser tried to kill their friend, Payton Leutner, in 2014.
Melissa Westendorf was appointed by a judge to evaluate one of the girls, Anissa Weier, now 15, after her insanity plea.
But she said she was not responsible for her actions on grounds of insanity.
A Wisconsin teenager involved in the Slender Man stabbing avoids prison time after a jury finds her mentally ill.
A detective who interviewed Leutner testified in the Waukesha County courtroom that Geyser had been scaring her beforehand with stories about characters from a horror website.
Geyser's trial is due to begin October 9. They're not taking issue with Weier having some mental illness, but say she was much more motivated by her fear of losing Geyser as a friend if she didn't go along with the plot. Her legal team successfully argued that she truly thought she was serving as a proxy for a supernatural creature called the "Slender Man".
Anissa Weier, 15, confessed to endeavored second-degree purposeful crime in an arrangement with prosecutors yet guaranteed she was rationally sick at the season of the assault and was not in charge of her activities.
Both Weier and Geyser were originally charged with attempted first-degree intentional homicide. She found guilty to attempted the second-degree intentional homicide.