From "'Lost' exclusive: Maggie Grace, a.k.a. Shannon, returns this season"
Maggie Grace, who played Shannon on Lost, will return to the ABC drama later this season, executive producers Damon Lindelof and Carlton Cuse confirmed to EW.com. “We’re really excited about having her back on the show,” says Cuse, “and we have a good story for her.” The producers would not specify how many episodes she would appear in. An original cast member, Grace exited the show in season 2 when her character — the spoiled stepsister of Boone — was killed off, though she did resurface in a season 3 episode. Harold Perrineau, Cynthia Watros, and Rebecca Mader are among the other dearly departed who will guest-star in Lost’s sixth and final season.