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Sirius Black later identifies Karkaroff as a former Death Eater. Karkaroff was captured by Auror Alastor Moody and imprisoned in Azkaban. Karkaroff later told the Ministry of Magic that he had seen the error of his ways, and "named names", putting many people in Azkaban in exchange for his freedom. Karkaroff is thus also hated by the Death Eaters. Karkaroff's history gives him a connection with Snape, also a former Death Eater. Karkaroff interrupts a Potions lesson demanding to talk to Snape, and shows him his Dark Mark reappearing. He also apparently has an unpleasant history with Alastor Moody, and tries to avoid him unsuccessfully for the entirety of the tournament, not knowing that it is Barty Crouch Jr. in disguise. At the end of the novel, following Voldemort's return, Karkaroff goes into hiding, leaving behind his student charges at Durmstrang. In the sixth novel, "Harry Potter and the Half-Blood Prince", Remus Lupin states that Karkaroff was found dead in a shack with the Dark Mark hovering over it, an indication that he was killed by other Death Eaters. Lupin also expresses surprise that Karkaroff managed to live even a year after deserting Voldemort and that no one else has been known to avoid capture quite as long.