 Dr. Heather Brooks dies in the premier of season ten . She goes to search for Dr. Webber and finds him lying in the basement of the hospital . Trying to save Dr. Webber , she accidentally steps into a puddle and electrocutes herself while hitting her head as she falls . Bailey moves a cancer patient in Webber 's room to force some perspective and make him take the treatment . Also introduced in the tenth season was Dr. Karev 's estranged father Jimmy Evans ( James Remar ) who tries to form a relationship with his son but fails repeatedly and ultimately dies in a botched surgery . The conclusion of season 10 has Cristina leaving Grey Sloan for Dr. Burke 's job overseas while Dr. Ross makes a last @-@ minute decision to follow her in order to study under her . Dr. Maggie Pierce ( Kelly McCreary ) unknowingly drops a bombshell that she is the adopted love child of Dr. Webber and the late Dr. Grey , which makes for yet another half sister of Dr. Meredith Grey . Also , Dr. Yang leaves her seat on the board to Dr. Karev while Dr. Webber all but promises the seat to Dr. Bailey . Introduced in season eleven is Dr. Nicole Herman ( Geena Davis ) who is Chief of Fetal Surgery at Grey Sloan Memorial , she mentors Arizona Robbins in a fetal surgery fellowship , Herman plays in a twelve episode arc before departing after episode fourteen . 
