Maddox was the Steelers' third-team quarterback after losing his second-team status to Charlie Batch mid-way through this past season.
Maddox, 34, had been with the Steelers since 2001. He replaced starter Kordell Stewart early in the 2002 season and led the team to the second round of the playoffs, but his game deteriorated in 2003 after he was hit and temporary paralyzed during a game.
Maddox lost his job early in 2004 to rookie Ben Roethlisberger, who guided the team to a 15-1 record.
The end for Maddox in Pittsburgh began when his interception in overtime against Jacksonville was returned for a touchdown in the Steelers' loss to the Jaguars.
Batch replaced Roethlisberger the next time the quarterback was injured and Batch guided the Steelers to wins over the Packers and Browns.
Batch was hurt against the Browns and the Steelers were forced to use Maddox one more time, and he quarterbacked them to a loss against the Baltimore Ravens.
During the season, Maddox compiled a passer rating of 51.7, far below the 76.7 passer rating he posted during his five years with the Steelers.