One Downton Abbey star is swapping country house living for city block killing. Downton Abbey star Dan Stevens has signed on to play a deranged serial killer in the highly-anticipated second season of Dexter: Resurrection. The acclaimed British star, who landed his breakout role portraying Matthew Crawley in the first three seasons of Julian Fellowes’ hit period drama, is the second actor to sign on for the next outing of the popular continuation. Season one brought back the murderous serial