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 ' fifth episode as OB/GYN Sir Philip Tapsell , who was present at the death of Lady Sybil Crawley from Eclampsia .
Tim Pigott-Smith