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Casey (biceps) is retiring from the NFL.
A 2011 third-round pick, Casey spent his first nine seasons in Tennessee, averaging 54.8 tackles, 12.8 QB hits and 5.7 sacks while playing 139 of a possible 144 games (including 137 starts). He then signed with the Broncos last offseason but suffered a season-ending torn biceps in Week 3. A free agent again this year, Casey is option for retirement at age 31.
