In his Frontier Biography, Dan Thrapp mentions an Albert Johnson (Johan Konrad Jonsen) who he identifies as "The Mad Trapper of Rat River" in Canada. Thrapp claimed that he was "almost certainly an American bank robber and murderer.' As a young man, he and a brother became acquainted with a former convict who called himself Bert Delker but whose true name may have been Martinus Mortenson. He married into the young men's family and after his wife's death inspired the brothers to enter into a life of crime which included bank robbery, horse theft, and grand larceny. Thrapp noted that Johan himself used a number of aliases and "no doubt committed more crimes than were charged against him." He wound up in Canada after fleeing the United States and was known to the people he encountered as being unsociable. He reportedly had a great deal of money which Thrapp noted "it may be doubted he derived from conventional labor." He reportedly lived as a trapper along what is called the Rat River. Accusations that he had been tampering with other trappers' traps caused him to be investigated by the Royal Canadian Mounties which ultimately led to a showdown. He had constructed a cabin that was later discovered to be a virtual fortress with a floor that was what is called "countersunk." Johan had fled the cabin and had used a blizzard to conceal his departure and route. This led to a massive manhunt after he fatally wounded one of his pursuers in a gun fight He was eventually cornered and killed following a manhunt of forty-five days. Thrapp noted that he "bore not a shred of identification on his person, nor had he left any in his cabin." It is noted that Dick North spent at least twenty years trying to learn the identity of the Mad Trapper and found divergent suspects not only in Canada and the Northern Tier but in Chicago and the Southwest as well. North came to the conclusion that Albert Johnson, Johnny Johnson, and Johan Konrad Jonsen were "one and the same person." This is the only source, other than Google, that I have found any information. North's book Trackdown: the Search for the Mad Trapper was published in 1989, and I will try to find a copy at my local library. Have any of you ever heard of him or do you have any information? Are North's conclusions accurate?