Morgan Geyser, teen involved in Slender Man stabbing case, sentenced

WAKESHA, Wis. (CBS58) -- A judge has sentenced Morgan Geyser to 40 years in the Slender Man stabbing case.

Geyser was 12 years old when she stabbed her friend 19 times. She had planned the attack for months with another girl, Anissa Weier.

Weier pleaded guilty in December and was committed to a mental institution for 25 years.

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