‘Slender Man’ stabbing case attacker found after cutting off monitor. What we know about the crime and the internet boogeyman

By Amanda Musa, CNN (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,