Slender Man jury ruled teen was mentally ill during attack

The teenager who admitted to participating in the stabbing of a classmate to please a fictional character will likely be confined to treatment in a mental facility.
2:14 | 09/16/17

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Transcript for Slender Man jury ruled teen was mentally ill during attack
from a jury deciding the fate of one of the teenagers at the center of the see ho-called slender man case. Anissa Weier will not be going to prison and erielle reshef joins us with more. Good morning, erielle. Reporter: 15-year-old Anissa Weier could have faced up to ten years in prison for her role in the stabbing of a classmate said to be inspired by that fictional horror character called slender man but overnight the jury deciding she should spend up to three years in a psychiatric hospital. Overnight a jury determini the fate of a Wisconsin teen who pleaded guilty for her part in nearly stabbing a friend to death after a slumber party. I will find that Anissa Weier was found not guilty by reason of in entall disease or defect. Reporter: The jury voting at the time of the crime 12-year-old Anissa Weier could not conduct herself because of mental illness. The 2014 case known as the slender man stabbing captivating the country. Her and her friend Morgan geyser luring Payton leutner into the woods stabbing her 19 times all to please that fictional online character. Is there any bleeding going on? Her clothing has got blood on it. Reporter: Leutner miraculously surviving the attack managing to crawl her way out of the park. In closing arguments Weier's attorney telling the jury that she suffered from a debilitating mental illness. Her lawyer blaming the internet for confusing Weier with what she called fake news about slender man. I was really scared knowing that slender man could easily kill my whole family in three seconds. Reporter: Throughout the five-day trial the jury of seven men and five women hearing from mental health professionals all of whom diagnosed Weier with shared delusional disorder. The teen avoiding what could have been up to a decade in prison now confined to treatment at a mental facility. And the victim's family telling ABC news they are disappointed in the jury's decision and it quote puts the community and our family at risk. Weier's co-defending Morgan geyser pleaded not guilty her trial slated for next month. This continues to get a lot of attention. Talking about teenagers. Thank you very much.

This transcript has been automatically generated and may not be 100% accurate.

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