A detective who interviewed 12-year-olds Morgan Geyser and Anissa Weier recalls the moment one of them confessed to their Slender Man murder attempt looking 'unusually calm', despite being covered in blood.
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Saying they had been inspired by the mythical character of the Slender Man, Geyser and Weier had lured their friend Payton Leutner out to play on 30 May 2014, going on to stab her 19 times and leave her for dead as they fled the scene.
Miraculously, Leutner survived, but has been left with many scars both physically and emotionally.
Speaking on an ABC's 20/20 programme - which also features an interview with Leutner - Detective Tom Casey discussed the moment he sat down with Geyser and Weier at a Wisconsin police station shortly after the incident.
Remembering the chilling encounter, Casey said Geyser seemed 'very calm'.
He said: "I mean, she's at a police department and she's covered in blood and... [it's as if] this is like a normal day for her."
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Casey had then asked the two girls whether Payton was dead or alive, and remembered that they didn't seem concerned.
He said Geyser told him: "I might as well just say it. We were trying to kill her.
"I figured that I'd get into trouble eventually, though, because Mommy always says that whatever you do catches up to you eventually, and it did."
In her police interview, Weier had also said: "We told her we were gonna get help, but we really weren't. We were going to run and let her pass away."
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The two girls had left Leutner for dead, but thankfully she was found by a passerby and taken to hospital.
In the 20/20 segment, Detective Shelly Fisher of the Waukesha Police Department also speaks out about interviewing young Leutner in the hospital, just under a week after the attack.
She said: "She was very, very quiet. We had to turn up the sound on the recording equipment really high, just to get her voice.
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"It took her a long time throughout the interview to finally get her to say Morgan's name or that Morgan had even stabbed her.
"I asked Payton how it stopped, and she simply said that Morgan just stopped and stared at her - that both her and Anissa for a while just stared at her with this blank stare."
Payton left hospital seven days after the attack, and was later able to return to school.
Both Geyser and Weier - now 17 years old - were sentenced to up to 40 and 25 years respectively in a mental health institution.
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They are currently being held at the Winnebago Mental Health Institute in Wisconsin, and must serve at least three years in locked confinement at the psychiatric institute.
Featured Image Credit: ABC