Dan Stevens will watch "Downton Abbey" to see what happens to Lady Mary Dan Stevens attends the Evening Standard Theatre Awards at The Savoy Hotel on Nov. 17, 2013, in London. Ben A. Pruchnie, Getty Images Actor Dan Stevens has no idea what's in store for season 4 of "Downton Abbey," but says he'll be watching to see what comes of Lady Mary (Michelle Dockery), who played his wife on the show. Stevens, who portrayed Matthew Crawley throughout the first three seasons, decided to exit the show last year to pursue other projects. In a dramatic exit, Stevens" character was killed in a car accident during the season 3 finale. Season 4 of "Downton," which has already aired in the U.K., will make its U.S. premiere Sunday on PBS -- and Stevens assures fans he will be tuning in from his Brooklyn, N.Y. home to see what happens. I want to watch it with the American audience...I have absolutely no idea what becomes of Mary because I want to watch it with the American audience -- it will be fun. After all, I live in Brooklyn now," the 31-year-old actor told The Hollywood Reporter. Back in March, Stevens addressed his departure, saying, "It's nice that people care, I suppose, about the show, but yeah, you know...I had to do what I had to do." Since leaving the show, Stevens has starred in "The Heiress" on Broadway with Jessica Chastain. He also appeared in "The Fifth Estate" with Benedict Cumberbatch and has been shooting "Night at the Museum 3."