Ten years ago, Dennis Curley went back to what he calls "the scene of the crime" — back inside Classroom 71 of his Ottawa school.

The St. Pius X High School alumnus was on a personal mission, bent on getting his life back.

For decades, Curley was gripped by nightmares about Oct. 27, 1975, the day a severely troubled classmate named Robert Poulin opened fire on their packed religion class with a shotgun bought at Giant Tiger.

It was one of Canada's first school shootings, and helped pave the way for new federal gun control measures . But it was only one half of what made that day so awful.

That morning, Poulin raped and murdered a neighbour and aspiring doctor, 17-year-old Kim Rabot, who was a student at Glebe Collegiate Institute. He then biked to St. Pius, wounded several more stude

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