Fifteen-year-old Morgan Geyser will appear in court on Oct. 5 to plead guilty to a charge of attempted first-degree murder, attorney Donna Kuchler said. However, the deal stipulates that Geyser was not criminally responsible due to her mental health, Kuchler told CNN.
Prosecutors allege Geyser and her friend Anissa Weier lured classmate Peyton Leutner into a park and stabbed her 19 times in May 2014, WTMJ reported..
According to law enforcement, the girls later told investigators they carried out the stabbing in an effort to become proxies of Slender Man, an online horror character..
Geyser and Weier, as well as the victim, were all 12 years old at the time. The victim recovered from her injuries, CNN reported.
Weier, 15, pleaded guilty in August to attempted second-degree homicide due to mental illness or defect in the stabbing as part of a plea agreement, CNN reported. In September, a jury said Weier was mentally ill when the attack occurred.
Weier will spend at least three years at a mental hospital before she can petition for her release, her lawyer, Maura McMahon, said at Weier's hearing. A judge could also order a commitment of up to 25 years, she said.
One of the girls encountered the name of Slender Man on a website known as Creepypasta Wiki, authorities said.