Jimmy Nicholl followed Calderwood when he took over as manager at Aberdeen, again serving as his assistant until the two parted company with the club in May 2009. He resumed his partnership with Calderwood at Kilmarnock in 2010. Nicholl was appointed manager of Cowdenbeath in June 2010, but he left Cowdenbeath at the end of the 2010–11 season after they were relegated from the First Division. Nicholl was then appointed assistant manager of Kilmarnock for a second time, by Kenny Shiels on 15 June 2011. Kilmarnock won the 2011–12 Scottish League Cup under Shiels and Nicholl, but Shiels was sacked by Kilmarnock
2011 Carlton Football Club season after struggling to hold his place in the team in 2010 as a midfielder, he became a permanent forward in 2011, where he kicked 56 goals in 24 games. In addition to Walker's 56 goals, Eddie Betts kicked 50 goals and Jeff Garlett kicked 48 goals; all three players finished inside the top twenty for the Coleman Medal. Carlton was the only club to have three players kick more than 40 goals in the home and away season. The Carlton Football Club Best and Fairest awards night took place on 4 October. The John Nicholls Medal, for the best and