He played college football for the Tennessee Volunteers and was signed by the Baltimore Ravens as an undrafted free agent in after the 2010 NFL draft.

Cox was a walk-on for the Tennessee Volunteers football team as a long snapper, earning a scholarship prior to the 2008 season.

[7][8] He earned the starting long snapper job after the Ravens released Matt Katula on August 14, 2010.

[5] Cox was part of the 2012 Baltimore Ravens Super Bowl XLVII victory over the San Francisco 49ers on February 3, 2013.

[11] On October 19, 2014, Cox tore his ACL against the Atlanta Falcons and was placed on season ending injured reserve the day after.

[28] Cox was named a team captain ahead of the 2024 season, where he played all 17 games and recorded a career high three tackles on punt coverage.