John Lithgow Cast in Season 4 of DEXTER June 18, 2009 Dexter, News Some of you might have already heard, but for those who haven’t, John Lithgow is joining the cast of DEXTER for its season 4. He will play Walter Simmons, another man who lives a dual life as a serial killer. Could it be that Dexter will meet another match? That’s what I’m hoping. According to Michael Ausiello: When the mad man (who is dubbed the “Trinity Killer” because he always kills in threes) relocates to Miami, Dexter becomes obsessed (or inspired?) by his efficient killing methods and ability to evade capture for almost three decades. Season 4 of Dexter will premiere on September 27, 2009 on Showtime. Share this:Click to share on Twitter (Opens in new window)Click to share on Facebook (Opens in new window)Click to share on Reddit (Opens in new window)Click to share on Google+ (Opens in new window)Click to share on Tumblr (Opens in new window)Click to share on Pocket (Opens in new window)