Donovan McNabb
McNabb was the Eagles’ starting quarterback for 10 years before his numbers fell off a cliff. He’s a shining example of how things can go wrong very quickly for an established star. In 2008, he had his best statistical season but two years later the Redskins benched him.
Philly fans lost patience with him before the franchise shipped him to Washington. The team hoped that his experience would steady the ship but everything went wrong for McNabb. In the end, he became their third-string QB before playing six games in Minnesota (via Bleacher Report).