In Series 6, Paddy was briefly abducted by the mother of a teenager who died after using his drugs, who in revenge repeatedly injected Paddy with heroin, causing him to become addicted to the substance. His attempts to conceal his new habit and deal with its effect on his life were a recurring theme of Series 6, with him finally going cold turkey later in the series, during which he had visions of his father Padraig. His mother's gravestone is shown in Series 6.