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 to join Rangers. He scored a goal, as well as, setting up two goals in his first appearance, in a Scottish League Cup tie against East Fife on 7 August. A week after he sustained an injury during a match which ruled him out for weeks, On 2 September 2012, Shiels scored his first league goal, as well as setting up a goal, in a 5–1 win over Elgin City. After scoring two goals in three games, Shiels scored against the Scottish Premier League side Motherwell, in a Scottish League Cup tie. Then, in the Scottish Cup, Shiels scored twice