Julia Stiles played Lumen Pierce.
Julia Stiles . She had a recurring role as Lumen Pierce in the fifth season of the Showtime series Dexter ( 2010 ) , a role that earned her nominations for the Golden Globe Award for Best Supporting Actress -- Series , Miniseries or Television Film and the Primetime Emmy Award for Outstanding Guest Actress in a Drama Series . Lumen Ann Pierce is a fictional character portrayed by Julia Stiles in the Showtime television series Dexter , season 5 .