Anissa Weier has been sentenced to 25 years in a mental institution for her role in the Slender Man stabbings.
16-year-old Weier was previously found not guilty by reason of mental disease or defect.
Payton Leutner survived 19 stab wounds in a Waukesha park in 2014. Leutner, Weier and the other girl charged in the stabbing, Morgan Geyser, were 12 years old at the time. Geyser was also found not guilty by reason of mental disease and will be sentenced in February.
This is a developing story. Check back for updates.
