Morgan Geyser, one of the girls convicted in the 2014 Slender Man stabbing, cut off her GPS monitoring bracelet and left her group home Saturday night, according to Madison police.

Geyser was last seen at 8 p.m. with an adult acquaintance. Police were notified of her disappearance Sunday morning. Anyone with information is urged to contact 911.

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In 2014, Geyser and Anissa Weier nearly killed their classmate by stabbing her 19 times as part of a plot involving the fictional character Slender Man.

Both girls were found not guilty because of a mental defect or disease in 2017 and were sentenced to mental institutions.

Geyser was released from the Winnebago Mental Health Institute earlier in 2025 and placed in a group home.

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