Lady Sybil Crawley Branson , played by Jessica Brown Findlay , dies after giving birth to a baby girl in the third season of Downton Abbey .
He also appeared on the ITV series , Downton Abbey in the third series ' ( third season ) fifth episode as OB/GYN Sir Philip Tapsell , who was present at the death of Lady Sybil Crawley Branson ( Jessica Brown Findlay ) from Eclampsia after giving birth to her daughter .
Tim Pigott-Smith