HOULTON, Maine — Gabriel Wortman crossed the border from Woodstock, New Brunswick, into Houlton, Maine, on April 25, 2019. Several days later, he returned into Canada, having managed to smuggle a semi-automatic Colt AR-15-style gun with him. A year later, he would use it and other guns to commit the worst mass-shooting in Canadian history. The 2020 Nova Scotia attacks, which started in the small town of Portapique, Nova Scotia, before moving to several other towns in the province, ended in the deaths of 23 people, including 51-year-old Wortman. The gunman had committed the killing spree by impersonating a police officer.