'Grey's Anatomy' Adds Neve Campbell Derek's Sister

REP SHEET: Neve Campbell
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Campbell, best known for Fox's "Party of Five" and the "Scream" film franchise, has signed with UTA

Grey's Anatomy is adding another Shepherd.

The ABC medical drama has enlisted Scream star Neve Campbell as one of Derek's sisters, The Hollywood Reporter has confirmed.

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As first reported by TV Line, Campbell will join the ninth season of Shonda Rhimes' Seattle-set drama as a sibling to Patrick Dempsey's Dr. Derek Shepherd, appearing in two episodes currently slated for December.

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It's not clear which of Derek's four sisters Campbell, who currently co-stars in Encore's 12-part miniseries Titanic: Blood and Steel, will play -- either the as-yet-unseen Kathleen or the mysterious unnamed fourth sibling.

Caterina Scorsone plays Amelia Shepherd on ABC's Grey's Anatomy spinoff Private Practice and Embeth Davitz previously appeared as his sister, Nancy.  

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Campbell joins the series as Derek is recouperating from the deadly plane crash that claimed the lives of his best friend Mark (Eric Dane) and sister-in-law Lexie (Chyler Leigh).

Grey's Anatomy returns next week at 9 p.m. on ABC. What do you think of the casting? See any family resemblance? Sound off in the comments below.

Email: Lesley.Goldberg@thr.com; Twitter: @Snoodit