One of the individuals involved in the notorious 2014 Slender Man stabbing has vanished after removing her ankle monitor and fleeing from her group home in Wisconsin.

Morgan Geyser, now 23 years old, escaped from the facility in Sun Prairie, a suburb of Madison, on Saturday night, according to officials.

She was last observed in the vicinity of the home with an adult companion, and as of Sunday morning, her location remains unknown.

Earlier this year, Geyser was conditionally released from a mental health institution and transferred to the group home to continue treatment for a psychotic spectrum disorder.

Over a decade ago, Geyser, along with Anissa Weier, coaxed their friend, Peyton Leutner, into the Waukesha woods during a sleepover, where they stabbed her 19 times. At the time, all three were just 12 years old.

During the vicious attack, Geyser carried out the stabbing while Weier cheered on the cold-hearted act of violence. 

The sinister duo then abandoned Leutner – leaving her to die – but she miraculously survived. She managed to crawl out of the woods, where a cyclist found her. 

Weier and Geyser had conspired for months to slaughter Leutner in the name of the fictional horror character Slender Man. 

Morgan Geyser appeared in court in January, when a judge ruled that she could be released if three experts testified that she was making progress in her battle against mental illness

Police shared a photo of Geyser, capture by a security camera, from earlier this month 

Peyton Leutner, pictured as a child, miraculously crawled her way out of the woods and survived

The pre-teens told detectives they had to kill Leutner to become Slender Man’s ‘proxies,’ or servants, and that the character would kill their families if they did not comply. 

They were both charged in adult court with first-degree attempted intentional homicide.

Weier had pleaded guilty to the lesser charge of attempted second-degree intentional homicide as a party to a crime, but the jury found her to be not guilty by mental disease or defect in 2017.

Slender Man is a fictional horror character  

She was sentenced to 25 years in a mental hospital but was granted release in 2021 after agreeing to live with her father and to wear a GPS monitor. She was freed from electronic monitoring two years later. 

Geyser, who has schizophrenia, pleaded guilty to first-degree murder, but as part of her plea deal, was found not guilty by reason of mental disease or defect in 2018. 

Waukesha County Circuit Judge Michael Bohren, who has since retired, had committed her to a psychiatric hospital for 40 years – a sentence she only served about 25 percent of.  

In January, Bohren said Geyser could be released after three experts testified that she was making progress battling her mental illness. 

During the same hearing, Geyser also came out as transgender, but female pronouns have continued to be used for court consistency, Dr Brooke Lundbohm, who psych evaluated Geyser, explained.  

Geyser, pictured at age 12, stabbed her friend 19 times as a sacrifice to Slender Man 

At the time, Dr Kenneth Robbins claimed that Geyser no longer had the psychosis symptoms that played a significant role in the violent assault she committed.

Lundbohm’s treatment team came to the same conclusion. 

‘I think either she was experiencing transient psychotic symptoms, which is to say psychotic symptoms that didn’t persist and gradually went away,’ Robbins explained. 

‘Or the intensity of her fantasies based on some of the trauma she had experienced were so intense that she believed them to be true.’

The trauma Robbins referred to was Geyser’s claims of sexual abuse by her father, who died in 2023.

Geyser’s father had also reportedly been diagnosed with schizophrenia, Stacie Leutner told ABC.  

But Geyser’s symptoms more closely align with post-traumatic stress disorder, anxiety and autism, Robbins said.

While Bohren agreed to Geyser’s release to a group home – effectively slashing her sentence by about three decades – the plan had to be reworked several times. 

Anissa Weier, pictured after the attack, cheered on Geyser as she stabbed the helpless victim

The judge approved it in July, but the process to remove Geyser from the secure mental hospital was difficult, as multiple group homes had turned her away. 

In March, Wisconsin health officials argued Geyser was in no condition to walk free from the institution after evidence emerged of an unsettling correspondence she was having with an ‘older man’ called Jeffrey, who sold murder memorabilia.

Jeffery, who first visited her in June 2023, sent her a letter after she was granted conditional release in January 2025. 

Geyser reportedly ripped it up and threw it away, Nicole Whiteaker, her conditional release program supervisor, testified in March.

Whiteaker said Geyser then asked for a no-contact order from Jeffrey, adding that she found details about Geyser on the man’s Facebook that were ‘concerning.’

Geyser had sent him her own sketch of a decapitated body and a postcard saying she wanted to be intimate with him. 

Geyser, pictured in 2017, pleaded guilty, but was found not guilty by reason of mental illness

Nicole Whiteaker claimed Geyser drew a concerning image of a decapitated man that she sent to Jeffery 

The drawings were described as ‘horror’ art. Jeffrey was reportedly selling the pieces that Geyser sent him. 

One of the drawings, shown in court, depicted an unearthly creature with the message ‘they crumble as they crawl.’

Geyser also ‘recalled that [Jeffery] would get sexual gratification from her index offense,’ Whiteaker said.