Morgan Geyser stabbed victim Payton Leutner 19 times while her friend Anissa Weier, who was sentenced to 25 years in a mental institution, urged her on.

One of two Wisconsin girls who tried to kill a classmate to win favor with a fictional horror character named Slender Man was sentenced to 25 years in a mental hospital, the maximum punishment possible.

A jury determined that she was mentally ill at the time of the attack.