She not only helped develop the hit 1970s show, but also acted in it, and had a decades-long career in film, TV and theater.

Sian Barbara Allen, who became one of the most popular television actresses in the 1970s and 1980s died Monday. She was 78. Allen died of Alzheimer’s Disease in Chapel Hill, North Carolina ...

LONDON, UK — Jean Marsh, the Emmy-winning British actress who co-created and starred in the groundbreaking 1970s television drama "Upstairs, Downstairs," died Sunday at her home in London.