An RCMP officer who was killed in Nova Scotia’s 2020 mass shooting was racing to support another officer when the fatal encounter with the gunman occurred near a highway interchange. New documents tabled at the public inquiry into the killings show Const. Heidi Stevenson died following a frantic exchange of gunfire with the killer, who had jumped a lane of traffic in his replica police vehicle in order to drive the wrong way down a highway ramp and slam into the Mountie’s cruiser. The incident took place on April 19, 2020, near Shubenacadie, N.S., the morning after the killer—disguised as an RCMP officer—murdered 13 people in the tiny rural community of Portapique, N.S. He would kill another nine people, including Stevenson and motorist Joseph Webber, before he was killed by police at a gas station outside of Halifax. According to a foundational document released by the inquiry, Stevenson was responding …