Woman involved in 'Slender Man' stabbing as teen wins release from mental hospital

July 2 (UPI) -- A Wisconsin woman who was sentenced to 25 years in a mental health institution for her involvement in the "Slender Man" stabbing attack of a friend is being allowed to leave after about three years, a judge has ruled.

The judge ordered Thursday that Anissa Weier can be released from the Winnebago Mental Health Institute near Milwaukee after officials draw up a plan for her release. She will remain there until at least her next hearing in September.

Weier was part of a 2014 attack on a classmate, Payton Leutner, during which the girl was stabbed 19 times. A friend, Morgan Geyser, inflicted the wounds but Weier was charged as an accomplice. All three were just 12 at the time.

Leutner survived and the other two were charged with attempted intentional homicide. Weier was ultimately found unfit for trial and sentenced to up to 25 years in the mental health center. Geyser received up to 40 years.

Weier and Geyser said they carried out the attack to appease the "Slender Man," a fictional supernatural character who's been depicted in some books and films. They said they believed he was real and that they would become his "proxies" if they killed Leutner.

Weier, now 19, asked earlier this year to be released and provided the court with medical accounts from three doctors who said she was no longer a danger to herself or others.

"I vowed after my crime that I would never become a weapon again, and I intend to keep that vow," she wrote in a letter to Waukesha County Circuit Judge Michael Bohren before Thursday's ruling, according to ABC News.

Geyser's parents said they're focusing on keeping the community safe.

"Our family has worked very closely with the Waukesha District Attorney's office throughout this process and we are aware of the pending conditional release. Through this entire ordeal -- we have continued to place Payton's safety and the safety of the community as our top priorities and those priorities will not change," Stacie and Joe Leutner said in a statement to ABC News.