Searcy made 195 tackles in 62 games with Buffalo, including 23 starts. Searcy had 58 tackles and three interceptions last season after recording 69 tackles and 3 1/2 sacks in 2013.
Searcy, who is 5-foot-11 and 207 pounds, joined the Bills in 2011 as a fourth-round pick out of North Carolina.
Earlier Wednesday, the Titans announced they have agreed to terms with wide receiver Harry Douglas, who had spent his entire six-year career with the Atlanta Falcons. Douglas caught 51 passes for 556 yards and two touchdowns last season.
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