he first appeared as a member of the watts family who had a difficult past and rough childhood, though his identity was unknown for almost thirty years. dennis' story arc commenced with the character murdering his mob boss jack dalton (hywel bennett), the crime kingpin of albert square whom dennis discovered is responsible for the apparent death of his infamous father - den watts (leslie grantham). following den's return in 29 september 2003, dennis established a longstanding conflict with his father up until den was ultimately killed off on the show's twentieth anniversary episode dated on 18 february 2005; dennis later discovered his father's fate on 29 august 2005, the same day he finally married his adopted sister sharon (letitia dean) after they managed to repair their once-forbidden romance.