Despite having hip surgery after the regular season that year, Cox came back to start 12 games as a junior, setting career highs in tackles (45), tackles for loss (10.5), and forced fumbles (two).

Injuries limited his effectiveness in 2016, allowing him to only make 19 tackles (2.5 for loss, 0.5 sack) in 11 games.

[3] Cox signed with the Carolina Panthers as an undrafted free agent following the 2017 NFL draft.

[7] Cox was waived during final roster cuts on August 31, 2019, and was signed to the practice squad the next day.

[20] On May 8, 2023, Cox Jr. signed with the Saskatchewan Roughriders of the Canadian Football League (CFL).