New young doctors in the residency program include Lexie Grey (Chyler Leigh), Meredith 's half - sister, who is killed with her love interest Mark Sloan in the season eight finale. Other additions include Leah Murphy (Tessa Ferrer), who departs near the end of the tenth season but returns during the thirteenth; Shane Ross (Gaius Charles), who departs with Yang in the tenth - season finale; Stephanie Edwards (Jerrika Hinton), who resigns during season thirteen; Jo Wilson (later Jo Karev) (Camilla Luddington), a doctor who begins a romantic relationship with Karev; Andrew Deluca (Giacomo Gianniotti), the love - interest of Meredith 's half - sister Maggie Pierce (Kelly McCreary), who also serves as head of cardio; and Benjamin Warren (Jason George), an anesthesiologist - turned - resident, who has to balance his own desire to succeed with his wife Miranda Bailey 's new role as Chief of Surgery. Season eleven sees the departure of Derek Shepherd, and in season twelve, attending cardio surgeon Nathan Riggs (Martin Henderson) joins the show. In the early episodes of season fourteen, Riggs leaves the series to start a life with Owen 's long - lost sister; by the season finale, Kepner and Robbins also depart the show.
who does deluca date in grey's anatomy
Meredith 's half - sister Maggie Pierce