John Pinette, the chubby stand-up comedian who portrayed a hapless carjacking victim in the final episode of "Seinfeld," has died. He was 50. Pinette died of natural causes Saturday at a hotel in Pittsburgh, the Allegheny County Medical Examiner's office said Sunday evening. Pinette's agent confirmed his death. The portly Pinette was a self-deprecating presence on stage, frequently discussing his weight on stand-up specials "Show Me the Buffett," "I'm Starvin'!" and "Still Hungry."