Grace Park, Daniel Dae Kim, Reiko Aylesworth

CBS' Hawaii Five-0 will say a final aloha to a familiar face in the May 16 season closer. "It's sort of our all-star episode," teases exec producer Peter Lenkov. "Jean Smart [Governor Jameson], Kelly Hu [Laura Hills] and Will Yun Lee [Sang Min] are all coming back." But one star will not return next season. "There will be a murder," confirms Lenkov.

On the possible hit list: Grace Park (Kono), who may have tired of living in Hawaii, plus Jean and Kelly, both of whom have new NBC pilots. Stressing that "pilots may not get picked up," Lenkov confirms that his cliff-hanger will be a "Holy crap! I-can't-believe-they-did-that whodunit!"

Subscribe to TV Guide Magazine now!