Weier's attorneys are trying to convince jurors she was mentally ill and should be committed to an institution rather than prison.
After a full day of deliberations, which lasted until late Friday night, a jury in Waukesha County found that Anissa Weier was mentally ill when she and a friend attacked another girl, leaving her to die in the woods.
Judge Michael Bohren told jurors they must decide whether Weier had a mental illness at the time of the crime and whether she lacked the capacity to understand her wrongful conduct.
The ruling means Weier will go to a mental hospital instead of prison.
She pleaded guilty in August to being a party to attempted second-degree intentional homicide but claimed she wasn't responsible for her actions because she was mentally ill. As part of the plea deal, she has agreed not to seek release from the institution for at least three years, but she could remain in the facility for up to 25 years.More news: Twelve Nobel laureates pen letter urging United Nations to act on Rohingya crisis
Mr Van Rybroek's expert testimony matched that of another psychologist who said Weier and Geyser had a shared delusion about Slender Man. "Anissa told [court-appointed psychologist Dr. Melissa Westendorf] that she didn't want Morgan to feel insane, so she said yeah", Waukesha County Deputy District Attorney Ted Szczupakiewicz said during closing arguments. "There've been consequences for three years, and it will continue one way or the other".
Weier told authorities that she and Geyser believed they had to kill Leutner or else Slender Man would kill them and their families.
"This sounds insane, because it is", McMahon said.
Leutner became so concerned about the stories that she asked her mother if they were real, according to Waukesha Police Detective Shelly Fisher. She has also pleaded not guilty by reason of mental disease.
Anissa Weier (l.) and Morgan Geyser are accused in the brutal Slender Man attack. With Geyser, Weier developed a "delusional belief system" and together they made a plan to kill Leutner and become Slender Man's proxies, Smith said. Geyser, who did the actual stabbing, is scheduled to go on trial next month.More news: Most Active Runner As Share Volume Pops for Oracle Corporation (NYSE:ORCL)
Prosecutors say a Wisconsin girl accused of helping stab a classmate to appease online horror character Slender Man participated in a cold and calculated attack.
Weier told investigators she and Geyser believed they had to kill Leutner or else Slender Man would kill them and their families.
Both Weier and Geyser were originally charged with being a party to attempted first-degree intentional homicide.
But she also pleaded not guilty due to mental illness of defect, setting up the trial on her mental status.More news: Anthony Weiner's Lawyers Question Motivation of Sexting Victim
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