The scene cuts to an upset Leroy Gibbs (Mark Harmon) saying, "Don't tell me about Ziva!"
"You thought her story was over. Now, the biggest NCIS secret of all will be revealed," a narrator says in the clip.
TVLine said the episode, titled "She," will follow the "NCIS" crew as they reopen an old missing persons case.
Bishop discovers David had kept notes on the case long after NCIS stopped investigating.
David left "NCIS" in Season 11 and was presumed dead in Season 13, although her body was never found.
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De Pablo said in April 2016 that she left "NCIS" because the scripts were no longer good enough for the character.
"Unfortunately, because of political things and the scripts not being good enough, I chose not to [continue]," the actress said.
"I love this character. I worked eight years in crafting this character and loving her, so when I felt or perceived the character was not being treated with the respect that she deserved, all the money in the world [couldn't make me stay]," she explained.
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