Direct from the Baltimore Ravens PR Department:

Oct. 13, 2009
 
For Immediate Release
 
RAVENS SIGN TYREE
 
The Baltimore Ravens signed WR David Tyree Tuesday afternoon, general manager/executive vice president Ozzie Newsome announced.
Tyree, originally a sixth-round draft pick by the Giants in 2003, enters 2009 having played in 73 games, posting 54 receptions for 650 yards and four touchdowns in the regular season.
The 6-0, 206-pounder also has four catches for 47 yards and one touchdown in the playoffs. Those postseason receptions include one of the most memorable catches in NFL history, when he pulled in a leaping 32-yard pass on third-and-five, trapping the ball against his helmet, to keep the Giants’ game-winning drive alive in Super Bowl XLII.
Tyree also has special team prowess, recording 85 tackles in his 6 seasons with the Giants.
 
To make room for Tyree on the active roster, Baltimore waived TE Tony Curtis.