LOS ANGELES, July 18 (UPI) -- Dermot Mulroney has joined the cast of Shameless.
The 50-year-old actor will guest star in a recurring role on the fifth season of the Showtime series. Mulroney will portray Sean Pierce, an ex-bad boy and recovering addict who becomes Fiona's (Emmy Rossum) new love interest and manager at Patsy's Pies.