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School officials found a Toronto-area teenager with a handwritten manifesto detailing a plan to abduct, torture, rape and kill a girl in the school’s “sound-proof music room.” The disturbing discovery came after a schoolmate was threatened with outrageous sexual violence in an online chat.

Quick intervention by a teacher and a call to police may have averted tragedy; a judge has declared the young man, who was 17 at the time, “a sadist” and found him guilty of threatening bodily harm.

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The man, who cannot be identified by court order, had previously been expelled from a school and had just enrolled at a new school when he took an interest in his victim. He said he had raped someone before but charges were dropped and he had spent months in a psychiatric facility.

The case is an example of how intervention should work, youth advocates say.

From the victim confiding to a teacher, a vice-principal calling police, investigators laying charges and a judge hearing the case just three months passed. The threats took place in December, and he was found guilty last week.