Despite being portrayed as one of the warmer of the Maguire family, Jamie has become somewhat of a dark and aggressive character, possibly due to him taking on the family business while his father was going cold turkey when recovering from drug addiction. Jamie is shown to go to extreme lengths to get revenge, sending one such message to Joe, after finding out about Karen's affair with him, by digging up his recently deceased father and leaving him slumped outside of the local shop. He also proves that unlike his two brothers, he is a very effective debt collector and head of the family business, having no qualms about threatening or injuring if it brings results.