Jeffrey Dean Morgan played The Comedian on a movie called “Watchmen”, which was also based on a comic book/graphic novel. I’m sure he’s done other stuff, but that’s where I know him.
Jeffrey Dean Morgan has been in many tv series as a ‘temporary’ character. He has starred in STARZ Magic City, Supernatural (a few seasons), Grey’s Anatomy.
http://www.imdb.com/name/nm0604742/
Also he and Maggie on WD play Bruce Waynes parents on Batman vs Superman