The feature, titled "Margaret," will star Lonergan's wife, actress J. Smith Cameron, and Matthew Broderick in a small role. "If he does well in that part, I may consider him for something bigger later," Lonergan joked to Playbill.com columnist Harry Haun. Lonergan added that the September start time was not yet firm, and the film still had to be fully cast. Both Broderick and Smith-Cameron acted in "You Can Count on Me," which starred Laura Linney and Mark Ruffalo as two very different grown siblings briefly dwelling together in the house they grew up in. The film was Lonergan's directorial debut.
Lonergan's stage plays include The Waverly Gallery, Lobby Hero and This Is Our Youth.
