Image Credit: Getty Images Morgan Geyser, one of the two convicted individuals in the infamous 2014 "Slender Man" stabbing case, briefly went missing in late 2025 after being released from a mental institution and brought to a group home. The case attracted attention across the country, as all suspects and the victim were 12 years old at the time that Geyser and a friend stabbed their classmate to prove that "Slender Man" - the fictional supernatural internet meme - was real. Below, learn about the "Slender Man" stabbing case and who Geyser is.