Tv & Show Grey's Anatomy: Why did Chyler Leigh leave Grey's Anatomy? What happened to Lexie Grey? Grey’s Anatomy season 17, episode 17 airs tonight (Thursday, April 1) on ABC. Chyler Leigh will make her return to the world of Grey’s Anatomy after nine years in tonight’s emotional episode but why did she leave the long-medical drama in 2012? April 1, 2021