Stage actress and Tony-winner Audra McDonald will take a rare stab at non-musical acting April 28, when she guests on "Law & Order: Special Victims Unit." McDonald plays a police psychologist who interviews the prime suspect in the case of subway sexual assault. Will the perp sing? Will Audra sing? Tune in at 10PM EST on NBC. McDonald, a three-time Tony winner, starred on Broadway this season in Marie Christine and is currently on a national concert tour.