Morgan Geyser and Anissa Weier

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Partners in Crime
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Fullname: Morgan Geyser
Anissa Weier
Origin: United States of America
Occupation: Middle school students (at the time of the stabbing)
Hobby: Reading Creepypasta stories
Goals: Sacrifice Peyton to Slender Man (failed)
Becomes "proxies" for Slender Man (failed)
Crimes: Attempted murder
Type of Villains: Delusional Murderers

Morgan Geyser and Anissa Weier are two pre-teen girls who were accused of the attempted murder of their then 12-year-old classmate on May 31st, 2014, in an incident that is now known as the Slender Man stabbing. They had planned on committing the murder in advance, and they had lured said victim into the woods of Waukesha, Wisconsin, and then proceeded to stab the victim 19 times. The victim was then found by a cyclist on that Saturday, and she was immediately taken to the hospital. A little more than a year has passed and the victim, Payton Leutner, is doing fine as of Wednesday, July 2015.


When questioned by the authorities of Wisconsin as to why they had attempted to murder their classmate, Morgan and Anissa were believed to have responded by saying that murdering someone was the first step to becoming a proxy for the Slender Man, a supernatural entity from Creepypasta lore that is believed to abduct children. Morgan and Anissa were tried as adults.


Morgan Geyser was the apparent leader of the two. Her intelligence is notable for her age and crime, but is little more than a personality description, along with the attributes of "quiet" and "psychotic". However, not only had Morgan and Anissa planned on murdering their friend days in advance, but went through two other well thought-out plans before deciding on luring their victim into the woods near a park, which suggests that Morgan not only knew what she was doing but was very aware of how and tried to do it in the most efficient way possible. The first plan was to murder Payton the night before by slitting her throat and then putting a blanket over her head to make it look like she was sleeping, and then leaving during the night. They changed the plan, partly but not entirely due to hesitation. That next plan was to murder Payton in a public bathroom at a nearby park, mostly because Morgan and Anissa were worried about the blood loss and what it would look like to others that happened to walk in, and made sure they had a place to drain the blood, but then must have realized that a public bathroom would make it way too easy for others to hear what was going on. Morgan has schizophrenia and hallucinates, and the attempted murder was a result of her mental illness; seeing Slender Man, or at least believing he was watching her, caused the whole thing. Morgan believes, after all, that Slenderman told her he required murder to get in his good graces. Schizophrenia is highly affected by treatment, and some believe Morgan deserves a second chance at a normal life.

Sentencing information

In 2017, Weier pleaded guilty to being a party to attempted second-degree homicide. A jury then found her "not guilty by mental disease or defect." Geyser accepted a plea offer under which she would not go to trial and would be evaluated by psychiatrists to determine how long she should be placed in a mental hospital. She later pleaded guilty but was found not guilty by reason of mental disease or defect, and was diagnosed with schizophrenia, from which her father also suffers.

Weier was sentenced to 25 years to life, an indeterminate sentence involving at least three years locked confinement and involuntary treatment in a state psychiatric institute, followed by communal supervision until age 37. 

Geyser was sentenced to the maximum, 40 years to life, an indeterminate sentence involving at least three years locked confinement, in addition to involuntary treatment in a state psychiatric institute until complete resolution of symptoms or until age 53, whichever may happen first; followed by continued communal supervision, periodic reevaluations and/or reinstitution and further treatment, as needed, as required by the sentence imposed.

In 2018, a Wisconsin judge sentenced Geyser to 40 years under mental health facility's supervision. While Geyser will periodically have the opportunity to petition for her release from a mental health facility in the future, she will remain under institutional care for the duration of the sentence. During her trial, Geyser had been committed to the Winnebago Mental Health Institute and was the youngest patient there.

In 2020, an appeals court rejected Geyser's petition to be retried as a juvenile. Her attorney, Matthew Pinix, argued that she should have been charged with attempted second-degree intentional homicide rather than first-degree, and argued that Geyser gave statements to investigators before being read her Miranda rights. He has petitioned the state Supreme Court to review the ruling.