On 16 May 2009, during the penultimate league match of the 2008–09 season at home to Aberdeen, Lafferty was involved in an off-the-ball altercation with Aberdeen player Charlie Mulgrew which ended with Lafferty reacting as if he had been headbutted. The referee, Stuart Dougal, sent Mulgrew off for violent conduct; however, television pictures showed little contact between the two players. Rangers went on to win the match 2–1. Upon reviewing the incident Rangers manager Walter Smith expressed his disappointment at Lafferty's conduct. Two days later it was reported that Rangers had fined Lafferty for his reactions in relation to the incident. The case was also referred to the Scottish Football Association's disciplinary committee, who rescinded Mulgrew's red card and gave Lafferty a two-match ban for simulation.