As a redshirt freshman in 2009, Williams took over as starting running back after starter Darren Evans suffered a season-ending ACL injury.

[1] Through thirteen games he rushed for 1,655 yards on 293 carries, scored 21 touchdowns, and broke multiple Virginia Tech and ACC rushing records in the process - including Virginia Tech's single season rushing yards record and the ACC single season touchdown record with 22 touchdowns.

On January 9, 2011, it was announced that Williams will give up his final 2 years of NCAA eligibility to make himself available for the 2011 NFL Draft.

[4] On August 19, during a pre-season football game against the Green Bay Packers, Williams was injured early in the third quarter in his first run of the game, suffering a ruptured patella tendon in his right knee which cost him the entire 2011 season.

On October 9, 2012, he was placed on the injured reserve list with a left shoulder injury, after playing in only 5 games.