Bree broke the rules and carlisle offered for her to become a Cullen but the volturi did not allow it so Jane told Felix to kill her
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The volturi Kill Bree because she broke the rules and they're is no excuse for that
It takes place during Eclipse, just before she is killed.
Diego died because he found out about Victroria's allience with the Volturi (or the clocked vampires as Diego and Bree knew them as).
Bree is one of the newborn vampires in eclipse who surrendered. Personal History:Bree was created by Victoria as part of her newborn vampire army to finally avenge James' death. She never saw Victoria and her "assistant," Riley, was the one who told the newborns what to do. When the battle came she surrendered herself to Carlisle, who planned to spare her life, but she was killed by Felix on Jane's orders for breaking the Volturi's laws.
There are quite a few: In Twilight, James wants to kill Bella In New Moon, Laurent does In Eclipse, Victoria does, In Breaking Dawn, The Volturi and Irina (Denali) do! Twilight Maniac yes the top answers are true but here are their reasons first James wants to kill her because her blood smells so sweet, then Laurent is the same, after that in eclipse Victoria wants to kill her because she blames Bella for her mate Jame's death, and Irina and the Volturi because they thought Renesmee, Bella's half vampire baby was an immortal child which is an illegal creation.
The volturi want to fight the Cullen family because of renesmee ( daughter of Bella and edward ) also because Bella is not a vampire and she knows to much about vampires. hope this helps x