A native of Allen, Texas, he attended Allen High School, where he collected more than 3,500 rushing yards in his career and scored 39 total touchdowns. Considered a four-star recruit by Rivals.com, he was rated as the 17th best running back prospect of his class, and drew comparisons to former Atlanta Falcons running back Michael Turner. On November 16, 2011, he committed to play college football at Arkansas, after he had previously been committed to Missouri.
College career
As a true freshman in 2012, he played in 11 games, and made two starts. He recorded 45 rushes for 231 yards and eight receptions for 208 yards and two touchdowns. He scored his first career touchdown on a 74-yard pass, his first reception of his career, on the first offensive play of the game against Kentucky. As a sophomore in 2013, he played in all 12 games, making 11 starts. He recorded 150 carries for 900 yards, scoring four touchdowns while adding seven receptions for 72 yards and two touchdowns. Teaming with true freshman Alex Collins, they produced Arkansas’ second pair of teammates to each rush for at least 900 yards in the same season. Darren McFadden and Felix Jones were the only previous tandem to do so, achieving the accomplishment in the 2006 and 2007 seasons. In 2014, despite splitting carries with Collins, he rushed for 1,190 yards on 211 carries and 12 touchdowns. On December 24, 2014, Williams announced on YouTube in a message to Razorback fans, that he would be returning for his senior season at Arkansas. During summer camp leading into the 2015 season, Williams suffered a foot injury that would force him to miss the entire upcoming regular season.
Professional career
Buffalo Bills
The Buffalo Bills selected Williams in the fifth round of the 2016 NFL Draft. On May 13, 2016, he signed a four-year contract with the Bills. On September 3, 2017, Williams was released by the Bills.
On November 14, 2017, Williams was signed to a two-year deal by the New Orleans Saints off the Broncos' practice squad. On September 1, 2018, Williams was waived by the Saints and was signed to the practice squad the next day. He was promoted to the active roster on September 8, 2018. He was waived on September 28, 2018.
Indianapolis Colts
On October 2, 2018, Williams was signed to the Indianapolis Colts' practice squad. He was promoted to the active roster on November 20, 2018. In Week 11 of the 2019 season against the Jacksonville Jaguars, Williams rushed 13 times for 116 yards in the 33–13 win. The following week, Williams ran for 104 yards and a score against the Houston Texans on Thursday Night Football. Williams appeared in nine games and recorded 49 carries for 235 rushing yards and one rushing touchdown on the 2019 season.
