What was NCIS named prior to being named NCIS ?
She then returns to assist Gibbs ' team at the end of season five , in " Judgment Day ( Part II ) " , after being suspected as a mole ( due to her sister being held captive ) , and is shot to death by Gibbs in " Dagger " ( Lee , being held as a human shield by the man responsible for making her a mole , gives Gibbs permission to do so in order to kill him too ) .