"I told her that I couldn't do it", Weier said, adding that her co-defendant "asked me whether or not she should do it" when they were in the woods.
Leutner thankfully survived the attack and was able to crawl to safety.
Weier spoke at length during the hearing, telling Waukesha County Circuit Judge Michael O. Bohren that she understood her plea and its ramifications.
Weier and her friend, Morgan Geyser, were charged with attempted first-degree homicide in the May 2014 stabbing of their classmate in Waukesha, a Milwaukee suburb.
There will still be a trial next month, at which time a jury will decide if she was mentally ill at the time of the stabbing, WISN 12 News reporter Nick Bohr said.
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"I didn't want to hurt Peyton", Weier said in court on Monday.
She later said Geyser told her killing somebody was the easiest way to prove Slender Man existed.
Geyser was also in court Monday afternoon, for a status conference. She has pleaded not guilty by reason of mental disease to attempted homicide charges in adult court.
Geyser's attorney, Anthony Cotton, said Monday that he and his client plan to proceed to trial.
In 2017, HBO released a documentary about the girls and their families: Beware the Slenderman. The lesser charge of second-degree homicide could yield a 10-year sentence, or following a trial next month, three years in a mental institution if Weier's found not guilty.