Grey’s Anatomy‘s forthcoming Amelia-centric episode has officially morphed into a full-fledged event. TVLine has learned exclusively that the Caterina Scorsone-driven hour will at long last introduce late Derek Shepherd’s oft-mentioned-but-never-seen fourth sister, Kathleen.
An ABC spokesperson confirmed that casting for the pivotal role is underway, but the rep declined to provide further details. Little is known about the mysterious Kathleen (aka “Kate,” but it was previously established that she — like her other siblings — is a doctor (her speciality being psychiatry).
Derek - Sisters - Scorsone - Amelia - Show
Of Derek’s other three sisters, only Scorsone’s Amelia remains on the show. The roles...