Ellen Pompeo pens "Grey's Anatomy" farewell note to fans: "You know the show must go on"

Ellen Pompeo, who plays the titular character on ABC's long-running medical drama "Grey's Anatomy" appeared to pen a farewell letter to fans on Thursday, a week after the show's midseason finale. 

"I am eternally grateful and humbled by the love and support you have all shown me, Meredith GREY and the show for 19 seasons!" she wrote on Instagram. "Through it all....none of it ...would have been possible without the best fans in the world." 

She told fans that they are responsible for making her time on the show "fun and iconic."