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It almost sounds like a dramatic plotline out of Downton Abbey, but alas for the show's star Michelle Dockery -- recent events in her life are her reality. Sadly, Dockery's fiancé John Dineen passed away at the age of 34 on Sunday after a short but fatal battle with a rare form of Cancer.

Last week, the British actress, who plays Lady Mary Crawley, was in the States to promote the final season of her hit ITV show but rushed back to be at Dineen's bedside. Dineen, a PR professional from Ireland, and the actress had been dating for two years after being introduced by castmate Allen Leech. The duo were engaged earlier this year, however Dineen was also diagnosed this year with the terminal disease that quickly took his life.

Dineen had been living in London but came home to Ireland to be with his family. He died at a hospice near his family home outside Cork. Dockery is said to be spending today, her 34th birthday, helping his family arrange his funeral. Dockery has thanked fans for their "support and kindness."

The Brit has kept mum on her relationship with Dineen, but said in 2014, "I have a wonderful man in my life from Ireland. We were introduced by Allen Leech. That's all you need to know."

A private funeral service is due to take place in Cork on Wednesday.