Oct. 27, 2025, marked 50 years since Ottawa was unmoored by a tragic series of events that continue to quietly resonate in the city to this day.

On a Monday afternoon in October 1975, a deeply troubled high school student named Robert Poulin raped and murdered his neighbour, 17-year-old Glebe Collegiate Institute student Kim Rabot, at his home.

Poulin then biked to his school, St. Pius X Catholic High School, with a sawed-off shotgun, opened fire on his religion class, wounded several students including 18-year-old Mark Hough, then used the gun to kill himself in the hallway.

Hough died over a month later in hospital, a victim of one of the first mass shootings at a Canadian high school.

Kim Rabot, left, and Mark Hough, right, were the victims of the Oct. 27, 1975, murders committed in

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