ziva came back to ncis season 7 in the first episode of season seven.
when does ziva come back to ncis season 7?
first episode of season seven
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after murdering special agent kate todd in the episode "twilight", and mounting several further attacks on ncis members (including gibbs) in the two part episodes "kill ari (part i)" and "kill ari (part 2)", his reign of terror finally comes to an end when ari is killed by his half-sister, mossad officer ziva david, who is later offered and accepts a position at ncis as mossad liaison officer. it is revealed in the episode "aliyah" by director vance that ziva had been under orders to kill ari, as he was out of control and planning a massive terrorist attack, and to gain gibbs' trust in the process, which ended whatever secret gibbs and ziva could keep from the rest of ncis. ziva initially does not believe that ari was an enemy agent and becomes his control officer in hopes of protecting him, until he nearly kills gibbs, when she hears the truth from his own lips. ziva does not fully come to terms with killing her brother, and experiences moments of guilt and hurt, even with her departure from mossad (after the beginning of season 7) and her new american citizenship coming through (in that season's finale episode "rule fifty-one"). haswari is mentioned various times even after the character's death and ziva's departure from ncis. in the season 12 premiere he is mentioned by his half-brother terrorist sergei mishnev, the main antagonist of the season (alex veadov), who attempts to kill gibbs in revenge.
list of ncis characters