As a young man, Igor Karkaroff was a Death Eater who served Lord Voldemort. After being captured and briefly imprisoned in Azkaban following his master's defeat, Karkaroff turned in several of his fellow Death Eaters in exchange for his freedom. As well as being Headmaster, he taught the Dark Arts itself at Durmstrang. On the night of the third task when his old master was reborn, the Dark Mark tatoo on his arm burned, telling that the Dark Lord was back. Fearing that his former comrades would kill him if he went, Karkaroff fled for his life. Roughly a year later, the Death Eaters hunted him to an old shack and killed him.