WMG / Phoenix Nights

Marion died offscreen during the final episode of Series 1

Marion vanishes before the end of series one, and come series two she's been replaced by Joyce and the rest of the cast act like she was always there. The reason for this: Marion died from a sudden heart attack whilst at home and since most of the staff didn't get on with her, they chose to pretend that she never existed. Also, everyone else was more concerned with Talent Trek (and the fire afterwards) than Marion.