From the Gale Force Nine website:
It is with great sadness, we have to announce our friend and colleague Sean Sweigart passed away over the holidays, due to complications following surgery.
Sean worked at Gale Force Nine for thirteen years. He was instrumental in designing Spartacus: A Game of Blood & Treachery, Firefly: The Game, Sons of Anarchy: Men of Mayhem, Homeland, WWE Superstar Showdown, Family Guy: Stewie’s Sexy Party Game, Star Trek: Ascendancy, and beyond.
Sean spent his life immersed in Science Fiction and Fantasy worlds. In the early 1990s he founded his own game store, Omnidon’s, in Hummelstown, PA. Before joining GF9, Sean worked with Games Workshop for four years, where he manned the Battlewagon and ran the Maryland Battle Bunker.
Sean always sought new challenges. He relished innovating and creating. Sean wanted to make thematic games that told stories, games in which people could immerse themselves. He succeeded, and was rightly proud of his work.
Sean was a close friend to those around him, passionate about games (among many other things!) and his presence will be sorely missed.