Leroy Jethro Gibbs' second wife Rebecca has been cast on NCIS!

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Helix actress Jeri Ryan has signed on to play the role of the mysterious character and will make her first appearance in January.

"After 12 seasons there was still one ex-wife to cast opposite Gibbs and we found her in the beautiful and talented Jeri Ryan," executive producer Gary Glasberg said in a statement. "We're all very excited to have Jeri join us for a storyline that's chock full of surprises."

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Gibbs has had several relationships play out throughout the show. He was first married to Shannon (Darby Stanchfield), but she and their daughter, Kelly, tragically died in a car crash.

His second wife was Diane (Mad Men's Melinda McGraw), who is also the ex-wife of Agent Tobias Fornell. Diane appeared in the season 11 episode "Devil Triad," which aired last December. And after Rebecca, Gibbs tied the knot to Stephanie, played by West Wing star Kathleen York.

Glasberg teased Rebecca's appearance back in January and said it will be "[storyline] gold."

"I can promise you that [the mystery wife] is probably going to get touched on in season 12," he told TVLine. "I have a little tiny space on my Dry Erase board for stories for next season, and that's already up there."

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

Tags: NCIS Jeri Ryan