One of the two girls who tried to kill a classmate to win favour with a fictional horror character named Slender Man has been sentenced to 25 years in a mental hospital, the maximum punishment possible.
Anissa Weier, 16, pleaded guilty in August to being a party to attempted second-degree intentional homicide, but she claimed she wasn't responsible for her actions because she was mentally ill. In September, a jury agreed.
Waukesha County Circuit Judge Michael Bohren on Thursday sentenced Weier to 25 years in a psychiatric institution, retroactive to the date of the crime. That means she would be institutionalised until age 37.
Weier and Morgan Geyser lured Payton Leutner into a wooded park in Waukesha, a Milwaukee suburb, in 2014.
Geyser stabbed Leutner 19 times while Weier urged her on, according to investigators. Leutner survived after she crawled out of the woods to a path where a passing bicyclist found her.
Both Weier and Geyser told detectives they felt they had to kill Leutner to become Slender Man's "proxies", or servants, and protect their families from him. All three girls were 12 years old at the time.
Anissa Weier listens to her former teachers giving evidence during her trial in September. Source: AAP
Weier expresses 'deeple regret'
Weier apologised in brief comments before her sentencing.
"I do hold myself accountable for this and that I will do whatever I have to do to make sure I don't get any sort of delusion or whatever again," Weier told the judge, as she sat next to her attorney.
"I want everybody involved to know I deeply regret everything that happened that day. I know that nothing I say is going to make this right and nothing I say is going to fix what I broke."
Leutner family spokesman Steve Lyons said they were pleased with the sentence.
"They believe that justice was served," Lyons said. "The sentence today allows for some additional closure for Payton and her family and it also keeps both Payton, her family and the community safe."
Leutner's mother, Stacie Leutner, sent the judge a letter this week in which she wrote that the trauma of the attack "has defined our lives" and that her daughter still fears for her life.
Morgan Geyser (L) and Anissa Weier (R) were 12 when they stabbed a classmate to honour the horror character Slender Man. Source: Police
For months, Payton slept with scissors under her pillow for protection, and she still keeps her bedroom windows closed and locked.
"She will struggle with the events of that day and physical and emotional scars it left for the rest of her life," her mother wrote.
In her letter, Leutner did not ask the judge to sentence Weier to a specific length of time in the mental hospital, but she said her daughter wouldn't feel safe if either of her attackers is released back into the community unsupervised.
In a deal with prosecutors, Geyser, who did the stabbing, pleaded guilty to attempted first-degree intentional homicide with the agreement that she isn't criminally responsible and shouldn't go to prison.
She will be sentenced in February, and prosecutors have asked that she be given at least 40 years in a mental hospital.
Slender Man started with an online post in 2009, as a mysterious spectre whose image people edit into everyday scenes of children at play.
He is regarded by his devotees as alternately a sinister force and an avenging angel.
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