In the last episode of Series 4, Jamie revealed that he had admitted his guilt in order to get parole so that he could hunt down his father's three former cellmates, who were planning to muscle in on Paddy's territory and dispose of him. His new reformed life was a sham to cover his murders of these three men. Karen assumed that his courtship of her was part of this pretence, but Jamie claimed that he really loved her and they were married at the end of the episode.