Teenager sentenced to 40 years in mental hospital for Slender Man stabbing

A judge sentenced Morgan Geyser, 15, who stabbed her classmate 19 times in order to appease a fictional horror character known as Slender Man, to 40 years in a mental hospital on Thursday.

Geyser and her friend Anissa Weier lured fellow classmate Payton Leutner in the woods during a sleepover before brutally attacking her in May 2014 when they were all just 12 years old.

Investigators say Geyser stabbed Leutner 19 times while Weier urged her on. The pair then left Leutner for dead, but the girl was able to crawl out of the woods and flag down a passing cyclist for help.

A Waukesha County Circuit Court judge handed down the maximum sentence after a daylong hearing in court, according to WPIX.

Weier was sentenced to 25 years in a mental hospital in December for her role in the attack.

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Anissa Weier is led out of the courtroom by a sheriff's deputy on Aug. 21, 2015 during the arraignment of the Slenderman stabbing trial in Waukesha County Court in Waukesha, Wis. The court entered a not guilty plea for them and moved to set a trial date in mid-October. (Michael Sears/Milwaukee Journal Sentinel/TNS via Getty Images)
Here Morgan Geyser is brought into court by a sheriff's deputy on Aug. 21, 2015 during the arraignment of the Slenderman stabbing trial in Waukesha County Court in Waukesha, Wis. The court entered a not guilty plea for them and moved to set a trial date in mid-October. (Michael Sears/Milwaukee Journal Sentinel/TNS via Getty Images)
Waukesha, Wisc., USA. 2nd July, 2014. A judge ordered a competency hearing for one of two Wisconsin 12 year-old girls accused of stabbing their friend to please the fictional Internet character "Slenderman" after experts deemed her mentally incompetent to proceed with her defense, July 2, 2014 in Waukesha, Wisc. © Michael Sears/Milwaukee Journal Sentinel/MCT/Alamy Live News
Waukesha, Wisc., USA. 2nd July, 2014. A judge ordered a competency hearing for one of two Wisconsin 12 year-old girls accused of stabbing their friend to please the fictional Internet character "Slenderman" after experts deemed her mentally incompetent to proceed with her defense, July 2, 2014 in Waukesha, Wisc. © Michael Sears/Milwaukee Journal Sentinel/MCT/Alamy Live News
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Girl, 12, proves incompetent to stand trial. 

(Photo by Twitter / @iChicagoNews)

Slender Man
The Slender Man - Teryn Cochron
LONDON, ENGLAND - OCTOBER 26: Yasmin Ouard poses as Slenderman from the series Mobile Hornets ahead of the MCM London Comic Con Expo at ExCel on October 26, 2012 in London, England. Visitors to the Comic Convention are encouraged to wear a costume of their favourite comic character and flock to the Expo to gather all the latest news in the world of comics, manga, anime, film, cosplay, games and cult fiction. (Photo by Dan Kitwood/Getty Images)
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Anissa Weier, accused of being involved in the stabbing of another girl related to the 'Slenderman' online story, is led into the courtroom on Thursday, Dec. 22, 2016 in Waukesha, Wis. (Michael Sears/Milwaukee Journal Sentinel/TNS via Getty Images)
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