Yes she does.
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To steal the Horcrux from Bellatrix Lestrange's vault.
Yes. In Harry Potter and the Deathly Hallows, she is tortured by Bellatrix Lestrange.
Bellatrix Lestrange died in Harry Potter and the Deathly Hallows Part 2.
Yes, Bellatrix Lestrange dies in Harry Potter and the Deathly Hallows. She is killed by Molly Weasley during the Battle of Hogwarts, because Bellatrix attacked Ginny.
Bellatrix Lestrange was a character featured in more than one film. She was part of Harry Potter and the Deathly Hallows: Part 2, Harry Potter and the Deathly Hallows: Part 1, Harry Potter and the Half-Blood Prince and Harry Potter and the Order of the Phoenix.
Saves peoples' lifes then gets killed by Bellatrix Lestrange.
Molly Weasley kills Bellatrix Lestrange in a duel, when Bellatrix was attempting to finish of her daughter. This happens near the end of the Battle of Hogwarts, in Harry Potter and thhe Deathly Hallows.
In Harry Potter and the Deathly Hallows, Bellatrix Lestrange tortures Hermione Granger at Malfoy Manor for information on Godric Gryffindor's sword.
She didn't have it back . She got Bellatrix Lestrange's wand instead.
In "Harry Potter and the Deathly Hallows," Dobby the house-elf is killed by Bellatrix Lestrange. During the Battle of Malfoy Manor, Bellatrix throws a knife at Harry and his friends as they Disapparate, and Dobby is hit by the knife as he apparates them to safety. Dobby dies in Harry's arms shortly after, leading to a heartbreaking moment in the series.
This event happened on pages 736 and 737 of the hardback version.