The whereabouts of Morgan Geyser, who in 2014 stabbed a friend 19 times to appease the fictional character "Slender Man," were unknown as of Sunday after she allegedly cut off her Department of Corrections monitoring bracelet and left a Wisconsin group home where she had been a resident, authorities said.

The Madison, Wis., police department said it was notified of the 22-year-old Geyser's disappearance on Sunday morning.

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