8 Places You Saw Jeffrey Dean Morgan Before The Walking Dead

Morgan's most famous role before Negan might be Denny Duquette in an unforgettable arc on the second season of Grey's. Why so famous? Well, he checks into Seattle Grace, falls hard for Izzie, Izzie/an entire audience fall for him . . . and then he never checks out. No Grey's Anatomy fan would ever be the same again, least of all Morgan, who said that it broke his heart to leave the show.