VIDEO : Jeffrey Dean Morgan Tweets Support For 'Supernatural's Final Season

Unable to play video. Supernatural is (finally) coming to end after a decade and a half, as the showrunners and stars have made the official announcement that the upcoming season 15 would also be the end of the show. Case in point: one fan-favorite member of the Supernatural cast is breaking his delayed silence about the show's ending: The Walking Dead's Jeffrey Dean Morgan, who has played Sam and Dean Winchesters' father, John Winchester.