Wilber attended Apopka High School where he was a Class 6A all-state third-team selection as a senior, after finishing with 55 tackles (10 for loss), four sacks and a fumble recovery.

[1] On March 19, 2012, Wilber attended Wake Forest's pro day, along with Chris Givens, Joe Looney, and six other prospects.

[6] Throughout training camp, Wilber competed for a backup outside linebacker role against Victor Butler, Adrian Hamilton, and Alex Albright.

[7] Wilber was making progress and receiving second-team reps at outside linebacker, but unfortunately suffered a broken thumb in the Cowboys' third preseason game against the Arizona Cardinals.

[8] Head coach Jason Garrett named Wilber the fifth outside linebacker on the depth chart to start the regular season, behind DeMarcus Ware, Anthony Spencer, Victor Butler, and Alex Albright.

[9] He made his professional regular season debut on special teams in the Dallas Cowboys' season-opening 19–3 victory against the New York Giants.

Throughout training camp, he competed for the job as backup defensive end against Monte Taylor, Ikponmwosa Igbinosun, and DeVonte Holloman.

[11] Wilber gained 15 pounds to his frame during the off-season and was named the backup right defensive end behind DeMarcus Ware to start the regular season.

[12] On September 22, he recorded two solo tackles and made his first career sack on St. Louis Rams' quarterback Sam Bradford in a 31–7 victory.

[13] On October 20, Wilber earned his first career start at defensive end after DeMarcus Ware was unable to play due to an elbow injury.

[19] Head coach Jason Garrett named Wilber the backup strong side linebacker to Bruce Carter to begin the regular season.

On September 14, Wilber made his first start of the season and recorded a season-high nine combined tackles during the Cowboys' 26–10 victory at the Tennessee Titans.

In Week 16, he recorded two solo tackles and made his only sack of the season on Indianapolis Colts' quarterback Andrew Luck in a 42–7 victory.

[22] The Dallas Cowboys entered the regular season with an entirely different linebacker core after experiencing the departures of Justin Durant, Bruce Carter, and the suspension of Rolando McClain.

[6][26] He entered training camp competing against Justin Durant, Anthony Hitchens, Andrew Gachkar, Damien Wilson, and Mark Nzeocha for the starting strongside linebacker.

His received minimal playing time on defense after being surpassed on the depth chart by Wilson in the seventh game against the Philadelphia Eagles.

On December 1, Wilber made a season-high two solo tackles and caused a critical forced fumble and recovery that helped the Cowboys' regain the lead in their 17–15 win at the Minnesota Vikings.

[31] Wilber he began the season as the starter in the base defense at strongside linebacker, before being passed on the depth chart by Damien Wilson in the seventh game against the Philadelphia Eagles.