Financial terms of the deal were not disclosed.
Leftwich was originally drafted by the Jacksonville Jaguars in the first round (seventh overall) of the 2003 NFL Draft out of Marshall. The 6'5", 250-pound quarterback spent his first four seasons in the NFL with the Jaguars before spending a season with the Atlanta Falcons in 2007 and the Tampa Bay Buccaneers in 2009.
The Washington D.C. native returns to the Steelers after spending three season in Pittsburgh (2008, 2010-‘11).
Leftwich has played in six games for the Steelers, as he completed 26-of-43 passes for 345 yards, two touchdowns and no interceptions. He has a passer rating of 101.4. He missed all of the 2011 season after suffering an arm injury during the preseason, which landed him on the Reserve/Injured list on September 2, 2011.
For his nine-year career in the NFL, Leftwich played in 55 games (49 starts) and accumulated 10,260 passing yards and 58 touchdowns with a passer rating of 79.7.