MADISON, Wis. (AP) — A Wisconsin woman who admitted to nearly stabbing a classmate to death in 2014 to please the online horror character Slender Man is missing after she cut off an electronic monitoring device and left a group home, authorities said Sunday. Madison police issued an alert Sunday for Morgan Geyser, now 23, saying she was last seen around 8 p.m. Saturday with an adult acquaintance.

“If you see Geyser, please call 911,” the alert said, adding that she had cut off a “Department of Corrections monitoring bracelet.”

Geyser was placed in a group home this year after being granted conditional release from the Winnebago Mental Health Institute. She was sent to the psychiatric institute in 2018 after pleading guilty to attempted first-degree intentional homicide in a deal with prosecutors to avoid prison. Geyser’s attorney, Tony Cotton, said Sunday that he did not know what happened with his client and urged Geyser to turn herself in.

“It’s in her best interest for her to turn herself in immediately and not continue with this course of action,” Cotton said in an Instagram video post where he addressed Geyser directly at times. “We don’t know any of the facts about what happened or who might have assisted her.”