The Titans also announced Monday they waived as injured cornerback Curtis Riley.
Hill hurt a knee during the Titans' organized team activities and needed the first eight practices of training camp to work himself into shape.
The 6-foot-1 Brown took part in the Titans' rookie minicamp on a tryout, and he had seven interceptions with 20 passes broken up with Division II Missouri S&T last season. He replaces Riley, who hurt an ankle Saturday practicing at Nissan Stadium.
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