We’re getting a clearer picture of what happened the night Gabriel Wortman started his killing spree in Nova Scotia.

At the end of nearly 12 hours Wortman had killed 22 people before being gunned down by RCMP at a gas station north of Halifax.

Dave speaks with the National Post's Christopher Nardi about what sparked the murders, how Wortman evaded detection for as long as he did and what questions remain unanswered.

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