NCIS returns from its brief hiatus Tuesday night and cast member Pauley Perrette revealed the episode's shocker - someone will be gone for good.

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"Back at work on #NCIS," she tweeted on Tuesday. "This Tuesday's episode is epic and also sad. Yes, we lose someone. See you on the small screen."

Of course she didn't offer any hints on which character will be on his or her way out, but some fans suggested it could be FBI Special Agent Tobias Fornell.

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Tuesday's episode also features the appearance of Gibbs' second ex-wife, Rebecca, who has never been seen on the CBS show before. The character, played by Jeri Ryan, will surprise Gibbs on a crime scene along with his first ex-wife Diane (Melinda McGraw). Gibbs, who is shocked to see them both, agrees to find out what they need from him.

Cast member Emily Wickersham, who plays Ellie Bishop, previously revealed to TVLine.com that it will be a special episode.

"The fans are in store for some goodies," she said. "We just finished shooting that episode, and it's a big deal for the team. And it'll be the same for the fans, a huge deal. It'll be an exciting one, for sure."

NCIS airs Tuesday at 8 p.m. ET on CBS.

Watch a sneak peek of Tuesday's episode below:

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