| 2/22/2013 5:53:00 PM |
Description: Ravens center Matt Birk has announced his retirement. SOURCE: Baltimore Sun | Insight: The 36-year-old finished his career on top by winning a Super Bowl in his final season in Baltimore. In 15 seasons, the Harvard graduate was invited to six Pro Bowls. He spent his first 11 seasons with Minnesota before signing with Baltimore in 2009. | | |