‘Slender Man’ stabber Morgan Geyser sent back to mental institution after escaping Wisconsin group home

“Slender Man” stabber Morgan Geyser will be sent back to a Wisconsin mental institution after her conditional release was revoked following her brazen escape from a group home last month.

The 23-year-old — who viciously knifed a fellow sixth-grade student over a decade ago to please a made-up internet boogeyman — appeared in Waukesha County Circuit court Tuesday where a judge granted the state’s Department of Health Services’ request to strip her of her recently-granted release privileges.

Geyser will now be sent back to the Winnebago Mental Health Institute, where she has spent the last seven years for carrying out the heinous 2014 attack on 12-year-old classmate Payton Leutner.

The ruling came after the deranged assailant said she would not dispute the state’s request.

Geyser was granted a conditional release from the psychiatric hospital in January and moved into a Madison group home in late October, despite strong objections from state health officials.

A month later, on Nov. 22, she cut off her ankle monitor and fled the home with her 43-year-old transgender pal, Chad Mecca, sparking a nationwide manhunt, according to the authorities.

The pair was arrested the next day in Posen, Illinois — some 170 miles from the group home.

Geyser and her preteen accomplice, Anissa Weier, avoided jail time after luring Leutner into a Waukesha park during a sleepover and stabbing her 19 times in an effort to impress “Slender Man,” an internet villain that was later the subject of a 2018 horror movie.

After the 12-year-old girls got the young victim to lie down under the guise of playing hide and seek, Geyser ambushed and hacked Leutner in the torso, arms and legs while Weier egged her on.

The victim miraculously survived the horrifying assault and crawled out of the woods until she was found by a passing cyclist.

The violent duo, who were arrested several hours later on the side of the road, told police they were walking toward where they believed Slender Man lived in a mansion.

In 2017, both were found guilty by reason of mental disease or defect and were committed to the Winnebago psych hospital — Geyser for 40 years and Weier for 25.

Weier was released in 2021 on the condition that she wear an ankle tag and move in with her father.

With Post wires.