Career
Born in Middlesbrough, Mulligan is a former scholar at Middlesbrough"s Academy whose progress was halted when he contracted a form of cancer. He made a full recovery but failed to make the first team squad and left to the club to join Norton & Stockton Ancients. In October 2009 he signed for Darlington and made his league debut in a 2–1 away defeat to Hereford United on 31 October 2009.
He was released by the club following their relegation from League 2, along with 13 other players.
He currently plays for whitby Town fc.