Kenny Shiels an "outrageous fabrication" on turning against him. He since he has no regret accusing Dallas, insisting it was a clear conscience. Once again, Shiels received a four-game ban after being found guilty of two charges over comment about Andrew Dallas. In March 2013, Shiels signed a returning striker, Kris Boyd, whose team [Kilmarnock] which he started his career with, on a free transfer. At the end of the 2012–13 season, with the club finished ninth place, endured their worst home record in more than 30 years, Shiels future at Kilmarnock was in doubt after making comment about Celtic in a
Dean Shiels cost-cutting that is due to take place at the club; manager Ally McCoist refuted this. On 8 February 2014, Shiels scored a hat-trick in the Scottish Cup, as Rangers won 4–0 against Dunfermline Athletic. On 10 June 2016, Shiels left Rangers after his contract came to an end. He had made 43 appearances for Rangers in his final season with the club, as they won promotion to the Scottish Premiership. On 25 August 2016, Shiels signed for Dundalk in the League of Ireland Premier Division citing the "lure of European football" as one of the things that attracted him to