The Cincinnati Bengals agreed to undisclosed terms with quarterback J.T. O'Sullivan, their fifth unrestricted free-agent addition for 2009.
O'Sullivan, a seven-year NFL veteran, had his busiest pro season in 2008, starting the first eight games for the San Francisco 49ers and playing in nine contests. He finished with a 73.6 passer rating, completing 128-of-220 passes (58.2 percent) for 1,678 yards with eight touchdowns and 11 interceptions.
"J.T. saw a lot of action last year, and we see him as a player with still a lot of upside," Bengals offensive coordinator Bob Bratkowski said in a statement released by the team. "He has experience in a number of systems and is a very sharp guy. We're happy to have him as a backup to Carson (Palmer)."
O'Sullivan entered the NFL in 2002 as a sixth-round draft choice of the New Orleans Saints out of California-Davis. He made his NFL debut with a brief late-game appearance for the Green Bay Packers in 2004. He saw his first action as a passer in 2007 with the Detroit Lions, playing in four games and completing 13-of-26 for 148 yards with one touchdown and two interceptions.
O'Sullivan's NFL totals include 14 games played with eight starts, and a passer rating of 71.0 on 141 completions in 246 attempts (57.3 percent) for 1,826 yards, nine touchdowns and 13 interceptions.
Unrestricted free agents who previously signed with the Bengals include wide receiver Laveranues Coles, running back Cedric Benson, linebacker Darryl Blackstock and safety Chris Crocker. Coles was with the New York Jets last season, and Benson, Blackstock and Crocker are players re-signed by Cincinnati.