He was originally expected to transfer to the University of Utah prior to the 2013 season, but was unable due to academic reasons.

[5] He entered the season splitting time with Bubba Poole, but eventually became the main running back.

[8] He posted the second-most yards (1,512) and third-most carries (292) in school history, earning a first-team All-Pac-12 Conference selection.

Booker opened the first 10 games of 2015 before suffering a season-ending knee injury,[9] finishing with 1,261 yards on 268 carries (4.7 avg.)

[13] Booker opened training camp competing for a roster spot as a reserve player behind veteran starter C. J. Anderson.

On his first NFL carry against the Carolina Panthers, Booker fumbled the ball and was recovered by former Grant High School teammate Shaq Thompson.

[14] Booker had his first career touchdown against the Houston Texans on October 24 after Anderson left the game with an injury.

[15] After Anderson was lost for the season, Booker became the starting running back the following week against the San Diego Chargers.

[19] After the departure of C. J. Anderson, Booker competed for the starting running back gig with third-round rookie Royce Freeman in 2018.

[20] Booker began the 2019 season as the third running back on the depth chart, behind second-year players Royce Freeman and Phillip Lindsay.