After the Return of the Dark Lord, Karkaroff escaped Hogwarts and was killed by Death Eaters, few months before Dumbledore's death. Despite their initial greetings, when Harry was selected to be the second champion of the Triwizard Tournament, Karkaroff lost his veneer of civilisaton towards Dumbledore.
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.
There, Karkaroff did everything he could to get his school's champion (Viktor Krum) in the lead, and flew into a panic when his Dark Mark began to burn. He fled when Voldemort returned, and for his treachery, Karkaroff was hunted down and murdered by his former comrades.
In Harry Potter and the Deathly Hallows: Part 2, Hermione's Stunning Spell sends Greyback off the Viaduct Courtyard to the ravine below and to his death after he was discovered mauling Lavender Brown.
Igor Karkaroff is a major antagonist in Harry Potter and the Goblet of Fire. He is a former Death Eater and the former headmaster of Durmstrang Institute. As a Death Eater, he was involved in the torture of many muggles and those who didn't support the cause of the Death Eaters.
Karkaroff's Trial | Harry Potter and the Goblet of Fire
Does Igor karkaroff go back to being a Death Eater?
It is most likely that he had betrayed many other Death Eaters, as Sirius Black stated that Karkaroff had "put a load of other people into Azkaban in his place". After Voldemort's rebirth, Karkaroff didn't return to Voldemort. He was eventually caught and killed by Death Eaters in 1996.
Igor Karkaroff, a former Death Eater and the former Headmaster of the Durmstrang Institute, was killed because of the same actions by which he was made the Headmaster. After the fall of Voldemort in 1981, he was arrested by the Auror Alastor Moody and sent to Azkaban.
While we don't know exactly what happened to Draco in between books five and six, fans speculated that he was bitten by werewolf Fenrir Greyback upon Voldemort's orders. This is the same evil werewolf that bit Remus Lupin as a child, permanently throwing him to the wolves.
It is unknown how Ron reacted when Lavender was killed by Fenrir Greyback, although when he saw her being savaged, Ron was clearly horrified and concerned but Hermione beat him to saving Lavender. Considering this, it is likely Ron at least was saddened by her death.
Rowling stated in an interview that Lupin and Tonks died to compensate for the last-minute reprieve she gave to Arthur Weasley when he survived a would-have-been fatal attack in Harry Potter and the Order of the Phoenix. Rowling also stated that it was Antonin Dolohov who killed him.
Mundungus Fletcher is one of six Order members to be disguised as Harry by means of Polyjuice Potion, and will ride with Moody. As they leave the house, they are attacked by multiple Death Eaters, and by Voldemort.
Ultimately, Hermione discovered the means by which Rita spied on others and forced her to "keep her quill to herself for a full year" by catching her in her beetle form while she was perched on the Hospital Wing window and trapping her in a jar imbued with an Unbreakable Charm so she couldn't transform.
Igor Karkaroff is in the Goblet of Fire as well - but that's not when he dies. He instead perishes two years later, with his body found in the Shrieking Shack. after going on the run following Lord Voldemort's return to power.
During the flight, Voldemort showed up and thought the real Harry was flying with Moody, but it was really Mundungus Fletcher. When Mundungus realized what was happening, he Disapparated, and Moody was hit with Voldemort's Killing Curse.
He had a reputation for "fighting fire with fire"; exhibiting the same sort of ruthlessness and brutality against criminals as some Death Eaters did against their victims. He was eventually killed by his Death Eater son, Barty Crouch Jr., who despised him. He and his son were the last of the pure-blood Crouch family.
Corban Yaxley, Colin's killer. However, even though his blood status prevented him from being taught at Hogwarts, Colin returned when he was recalled along with other members of Dumbledore's Army back to the school when Neville Longbottom informed them of the upcoming battle via their D.A. coins.
Luna married fellow naturalist Rolf Scamander, grandson of Fantastic Beasts and Where to Find Them author Newt Scamander, considerably later in life than Harry, Ron, Hermione, and Ginny, who all married and started families in their early-to-mid twenties.
Lavender dies during the battle of Hogwarts. In a blink-and-you'll-miss-it moment, fans can see her body ravaged by Fenrir Greyback. Hermione blasts him away, but it's too late to save Lavender.
In 1997, he suffered severe facial wounds at the hands of the vicious werewolf Fenrir Greyback during the Battle of the Astronomy Tower. Although untransformed at the time, Greyback's lycanthropy caused the wounds to be cursed. The scars could not be treated totally, leaving Bill heavily scarred.
His savagery and evil surpass Voldemort, but he lacks the magical knowledge, ability and intellect that would allow him to be an ambitious Dark Wizard like his master.
Fenrir Greyback was present at the Battle of Hogwarts, where he was repelled by Hermione Granger while attempting to attack Lavender Brown. He hit the marble staircase banister and attempted to return to his feet, but before he could, he was struck on the head by a crystal ball from Sybill Trelawney.
Mundungus' betrayal caught Moody by surprise and gave Voldemort enough time to cast the Avada Kedavra and kill Mad-Eye Moody. After he was brutally killed by Lord Voldemort, Moody's dead body tragically fell from his broom.
Whose name did Igor karkaroff put in the Goblet of Fire?
Before the goblet gives it's results, there is a scene in the movie, where Igor Karkaroff secretly walks into the chamber, when the goblet is placed. This indicates that he is the one who put Harry's name in the goblet, but that is not true, it was Barty Crouch.
Bellatrix Lestrange briefly tortured Neville with the Cruciatus Curse, both to try to make Harry hand over the prophecy and to see how long Neville held out before "cracking" like his parents.
