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.

She won an Emmy as Rose Buck, the prim and proper parlor maid, and also appeared in Shakespeare plays, a Hitchcock thriller and the fantasy film “Willow.”

Jean Marsh, the British actress who co-created the enduring serialized hit TV series "Upstairs, Downstairs," died Sunday at the age of 90. The Sunday Times of London said Marsh died at her London home due to complications from dementia.