None of us are getting any younger but which sitcoms have effectively died as all the main characters have passed away?
When Frank Thornton popped his cloggs that left Mr Rumbold (Nicholas Smith) and Mr Spooner (Mike Berry), the latter being a replacement character anyway. Dad's Army still has Private Pike, Hodges and the Vicar while On the Buses lives on through only Anna Karen as Olive Rudge. Porridge only has a few left (Lukewarm and Bunny Warren plus the Scots guy) but again, these were more secondary characters.
It's a bit morbid but can you think of any shows with four or more in the main cast that have all gone?