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Vampire Diaries: Why Stefan and Damon Didn't Die When Katherine Did
In the television adaptation of The Vampire Diaries, the vampires Stefan (Paul Wesley) and Damon Salvatore (Ian Somerhalder) do not die when their sire, Katherine Pierce (Nina Dobrev), is killed. The series establishes the concepts of a sireline, or metaphorical vampire ancestry, as well as a vulnerability where all vampires of a sireline die when the sireline originator is killed. Katherine Pierce loses her vampire status and is later killed, but Damon, Stefan, and the vampires they sired, including Caroline Forbes (Candice King), are unaffected and able to continue their roles in The Vampire Diaries and its spinoffs.