Albert Johnson, also known as the “Mad Trapper,” outlaw (born circa 1890–1900, place of birth unknown; died 17 February 1932 in Yukon). On 31 December 1931, an RCMP constable investigating a complaint about traplines was shot and seriously wounded by a trapper living west of Fort McPherson, NT. The ensuing manhunt — one of the largest in Canadian history — lasted 48 days and covered 240 km in temperatures averaging -40°C. Before it was over, a second policeman was badly wounded and another killed. The killer, tentatively but never positively identified as Albert Johnson, was so skilled at survival that the police had to employ bush pilot Wilfrid “Wop” May to track him. The Trapper’s extraordinary flight from the police across sub-Arctic terrain in the dead of winter captured the attention of the nation and earned him the title “The Mad Trapper of Rat River.” No motive for Johnson’s crimes has ever been established, and his identity remains a mystery. This article contains sensitive material that may not be suitable for all audiences.