He played college football at Kent State University, and was signed by the Atlanta Falcons after going undrafted in the 2014 NFL draft.

He joined the Golden Flashes football team as a defensive lineman and played his freshman season under head coach Doug Martin.

He continued in Week 8 with five tackles, two sacks, 3.5 tackles-for-loss, and blocked an extra point in a win over Bowling Green.

[4] Nix was voted as a team captain by his coaches and teammates and opened his junior season with eight tackles, four tackles-for-loss, and a sack against #7 FCS Towson.

In Week 4, he recorded five solo tackles, two tackles-for-loss, a sack, and a forced fumble in a 45–43 victory over Ball State.

For his last season at Kent State, he finished with a total of 41 tackles (22 solo), 13 tackles-for-loss, 3.5 sacks, and two forced fumbles.

[4] Nix ended his collegiate career leading Kent State with 65 tackles for a loss and second in school history with 25 sacks.

Even though he had a productive career as a defensive end at Kent State, Nix was projected to go undrafted due to his small stature for his position and was not invited to work out at the NFL Combine.

[5] Representatives from eight NFL teams showed up to Kent State's Pro Day to watch 11 prospects including Dri Archer.

[10] To have a better opportunity to make the 53-man roster, Nix switched positions from linebacker to fullback but was eventually released by the Falcons on August 3, 2014.

[11] On January 9, 2015, the Pittsburgh Steelers signed Nix to a one-year, $435,000 reserve/futures contract, reuniting him with former Kent State teammate Dri Archer.

His first forced fumble was during Week 9 of the 2015 NFL season, on special teams, when the Steelers hosted the Oakland Raiders.

[15] He was the only fullback on the roster throughout training camp, making him their de facto starter to begin the regular season.

[16] On December 10, 2017, Nix scored his first career touchdown on a one-yard pass by Ben Roethlisberger in the fourth quarter of a 39-38 comeback victory over the Baltimore Ravens.

[17] On December 25, Nix scored his first career rushing touchdown with a one-yard run against the Houston Texans in the second quarter.

[19] On December 23, Nix briefly became the subject of ridicule for celebrating what he thought was a fourth down conversion on a fake punt against the New Orleans Saints when in actuality he was stopped a yard short.

[21] Nix was designated for return from injured reserve on December 26, and began practicing with the team again, but was not activated as the Steelers failed to make the playoffs.