MADISON, Wis. (AP) — A Wisconsin woman who admitted to nearly stabbing a classmate to death at age 12 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.

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