John Pinette

Standup comedian John Pinette -- best known for his role as the guy who got mugged in the "Seinfeld" finale -- was found dead in his Pittsburgh hotel room Saturday ... TMZ has learned. The Allegheny County medical examiner's office says Pinette died in his Sheraton Hotel room around 2:30 PM ...…

John Pinette -- best known for his role as the fat guy who got mugged in the "Seinfeld" finale -- has checked himself into rehab after becoming addicted to prescription medication ... TMZ has learned. A rep for the venue in Canada where John was set to perform in next month says Pinette had to…