(CNN) — On a chilly Saturday night, Morgan Geyser left the group home where she was living in Madison, Wisconsin, and met up with an acquaintance on a quiet residential street nearby.

Before she vanished, police say the 23-year-old cut off the monitoring bracelet law enforcement used to track her whereabouts, years after she pleaded guilty to attempted murder in the “Slender Man” stabbing of her 12-year-old classmate.

Payton Leutner was stabbed at Waukesha park in 2014 by Geyser and her friend Anissa Weier, who were also 12 at the time. The girls told investigators the attack was meant to impress the fictitious boogeyman.

Late Sunday, Madison police said they received confirmation that Geyser was taken into custody in Illinois, more than a hundred miles away.

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