Denver also on Monday placed rookie safety Darcel McBath on injured reserve with a broken forearm suffered against Indianapolis on Dec. 13.
Fox (5-foot-10, 206 pounds) is an eighth-year safety who played for the Broncos in 2008 before being released following the 2009 preseason. He was out of football since being released on Sept. 5. Fox entered the NFL with San Diego as a college free agent in 2002 and played two seasons each with the Chargers (2002-03), Detroit (2004-05) and Washington (2006-07) before joining the Broncos as a free agent on Sept. 23, 2008.
In his career, Fox has totaled 105 tackles (81 solo), two interceptions (21 yds.) and a fumble recovery in 96 games (14 games). He added 48 tackles and a blocked punt on special teams. As a Bronco, Fox appeared in 10 games (3 starts) and returned a fumble 23 yards for a touchdown at the N.Y. Jets on Nov. 30, 2008. He also totaled 20 tackles (13 solo) and three special-teams stops.
At Fresno State University, Fox was a two-time All-Western Athletic Conference selection after amassing 289 tackles, 10 sacks and four interceptions.
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Fox earned first-team All-Sunset division recognition as a running back at Cimarron-Memorial High School and was born Oct. 9, 1979, in Las Vegas.