Grey's Anatomy Enlists Amy Acker to Play Derek Shepherd's Elusive Fourth Sister

With Derek Shepherd's (Patrick Dempsey) elusive fourth sister finally headed to Grey's Anatomy, we now know who is set to play her.

The Gifted star Amy Acker will take on the role of Kathleen Shepherd in an upcoming episode centered around Amelia. Although she was first mentioned in Season 3, this

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