Hawaii Five-0 - Season 5 - William Mapother to Guest - best f y

Another Lost vet is set to pop up on Hawaii Five-0: William Mapother, who played creepy island resident Ethan Rom, will guest-star in an episode of the CBS police drama, EW has learned.
Mapother—who has recently popped up on shows including The Mentalist, Mad Men and Castle—will play Eric Porter, a likable, wealthy business owner who gets entangled in a painful and tense situation but offers his help to the authorities. His episode is slated to air sometime this fall.