Free agent center Kyle Cook, who last played for the Cincinnati Bengals, is retiring, reports Adam Caplan of ESPN NFL Insider.
Cook started all 16 games last season for the Bengals, but was released by the team in March.
The 31-year-old spent six seasons in the NFL, all with Cincinnati.
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Cook went undrafted out of Michigan State before signing with and being released by the Vikings in 2007. He found a home on the Bengals practice squad and saw his first NFL action in 2008, becoming a starter a year later.
- Molly Geary