[6] Having suffered a back injury in pre-season[7] Williamson found himself sidelined until the end of October and had to wait until December to score his début goal for the club against Crystal Palace.

"[9] On 26 July 2012, on Sheffield United's pre-season tour of Malta, manager, Danny Wilson confirmed Williamson would not sign a new deal with the club and had subsequently been told to stay away from training with the squad.

[11] He made his debut away at Arsenal in the fifth round of the FA Cup, playing the whole match in gloves alongside Jason Lowe as his new team produced a surprise 1–0 win, courtesy of a late Colin Kazim-Richards goal.

On 14 September 2013, Williamson was red-carded in the East Lancashire derby against Burnley after fouling striker Danny Ings in a last man situation during injury time with the scores level at 1–1.

This was well received by the fans of Blackburn Rovers as an admirable and selfless piece of good play for the sake of the team, preventing the first local derby defeat for 35 years (11 attempts).

[2] He made his international debut on 8 September 2015, playing the full 90 minutes for Jamaica as they beat Nicaragua 4–3 on aggregate to advance to the Fourth CONCACAF Round of qualifying.