One of the attackers behind the infamous 2014 Slender Man stabbing has gone missing after cutting off her ankle monitor and escaping her group home in Wisconsin.
Morgan Geyser, 23, fled the facility, located in Sun Prairie, a suburb of Madison, on Saturday night, according to authorities.
She was last seen near the home with an adult acquaintance, and her whereabouts remain unknown as of Sunday morning.
Geyser was granted conditional release from a mental institution earlier this year and sent to the group home.
More than 10 years ago, she and Anissa Weierr lured their friend, Peyton Leutner, into the woods of Waukesha during a sleepover and stabbed her 19 times. They were all 12 years old at the time.
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 didn’t follow through.
They were 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.
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.
Slender Man is a fictional horror character
Geyser, who has schizophrenia, pleaded guilty to first-degree murder, but as part of her plea deal, was convicted but 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.
At the time, Dr Kenneth Robbins claimed that Geyser no longer had psychosis symptoms that experts agreed played a significant role in the violent assault she committed.
Geyser, pictured at age 12, stabbed her friend 19 times as a sacrifice to Slender Man
Lundbohm’s treatment team came to the same conclusion.
When the judge asked Robbins if Geyser was ‘faking’ her psychotic symptoms back in 2014 when the stabbing occurred, he quickly responded ‘no.’
‘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 was referring 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.
Geyser’s symptoms more closely align with post-traumatic stress disorder, anxiety and autism, Robbins added.
While Bohren agreed to Geyser’s release – effectively slashing her sentence by about three decades – the original plan had to be reworked.
In March, prosecutors rejected the proposal to integrate Geyser back into society after Leutner’s mother, Stacie, expressed concern that Geyser’s group home was set to be just eight miles away from her daughter.
Anissa Weierr, pictured after the attack, cheered on Geyser as she stabbed the helpless victim
The judge then ordered the Department of Health Services to draft a new plan, which was approved 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.
‘I asked Ms Geyser who are the people she’s communicating with on the outside, and his name came up,’ Nicole Whiteaker, he conditional release program supervisor, testified in March.
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, Whiteaker said.
‘After the team became aware of him, it was during that meeting that Ms Geyer asked for a no contact order,’ Whiteaker said, adding that she found details about Geyser on the man’s Facebook that were ‘concerning’.
She had sent him her own sketch of a decapitated body and a postcard saying she wanted to be intimate with him.
‘We found that there were letters and drawings that she had sent him. A postcard,’ Whiteaker said. ‘And he was selling them.’
Nicole Whiteaker claimed Geyser drew a concerning image of a decapitated man that she sent to Jeffery
The drawings were described as ‘horror’ art, which concerned Whiteaker and her team.
The pieces of art were labeled with Geyser’s name, so potential buyers knew what they were getting, according to Whiteaker’s testimony.
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 and I believe there was letters written back and forth’ about that, Whiteaker said.
Geyser also did not reveal to her therapists that she had been reading a novel with violent themes about murder and black market organ sales called Rent Boy.
But her lawyer, Tony Cotton, pushed back, saying Geyser only read what the facility allowed, and staff knew she had been communicating with the collector.
He also pointed out that Geyser was the one who asked for the no-contact order, something she requested when she found out that Jeffery was sexually interested in her crime.
