In this final episode, the gunman is killed in a chance encounter with police at a gas station, ending 13 hours of horror in Nova Scotia. 

But this story begins decades before April 18, 2020. Family members describe a pattern of abuse in the Wortman family going back generations. And experts say there are links between childhood maltreatment and violence.

In fact, a history of childhood abuse and neglect is very common among mass shooters in the United States. It’s one of four commonalities that researchers call the pathway to violence. Experts say ending the cycle of violence for good is one way we can prevent mass shootings from happening. 

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