A native of Laurinburg, North Carolina, Robertson attended Scotland High School, where he was teammates with Terrell Manning.

For the season, Robertson was credited with seven tackles, including four solo stops, a pass break up and a quarterback hurry.

Four weeks into his junior season, Robertson suffered a season-ending right knee injury against Ole Miss.

He was the last of six South Carolina Gamecocks selected in this draft class, after Stephon Gilmore, Melvin Ingram, Alshon Jeffery, Rokevious Watkins, and Antonio Allen.

[11] On September 5, 2015, Robertson was waived for final roster cuts before the start of the regular season.