Yes. In the Season 3 finale of Downtown Abbey, Matthew Crawley (Dan Stevens) met his tragic death shortly after the birth of his first child. He died in a car accident.
Sources suggest that Dan Stevens left the series at the end of Season 3 and starred in "The Heiress" on Broadway and also in a movie titled "Summer In February." These are the reasons why Downton creator Julian Fellowes ended his character.
Hit British period drama series Downton Abbey Season 4 premiered on Sunday January 5.
A recent episode of the series on PBS featured a guest appearance by one of opera's biggest living talents: Dame Kiri Te Kanawa. The New Zealand-born soprano played Dame Nellie Melba, an actual opera singer who hailed from Australia and whose career spanned the late 19th and early 20th centuries. Catch more at Los Angeles Times.