Very interesting thread.
Akito Nakatsuka (Ice Climber, Excite Bike, Zelda II: Link's Awakening)
Last known game work: Brain Age: Train Your Brain in Minutes a Day! (2006)
Izuho Takeuchi (Phantasy Star III)
Last known game work: Phantasy Star III (1991)
Seiichi Fukami (Gradius II, Gradius III)
Last known game work: X-Men (1992)
Tokuhiko Uwabo (Alex Kidd in Miracle World, Columns, Phantasy Star)
Last known game work: Sorcerian (Mega Drive) (1990) (I'm not 100% sure)