Downton Abbey Star Michelle Dockery Devastated After Fiancé Dies of Cancer at 34

updated 12/15/2015 AT 09:00 AM EST

originally published 12/15/2015 AT 07:45 AM EST

Downton Abbey star Michelle Dockery has been left devastated after her Irish fiancé died of a rare form of cancer, PEOPLE has confirmed.

Commercial public relations executive John Dineen died on Sunday at the Marymount Hospice in Cork, with Dockery at his bedside. He was just 34.

In a statement released through her publicist, Dockery thanked the public for the "support and kindness" the family has received, before adding that she "kindly request that they are left to grieve in private."

Downton Abbey Star Michelle Dockery Devastated After Fiancé Dies of Cancer at 34| Death, Michelle Dockery

Michelle Dockery with fiancé John Dineen (left)

David M.Benett / Centrepoint / Getty Images for Centrepoint

Dineen, from Cork, Ireland, was diagnosed with a rare form of cancer earlier this year.



A senior director at London-based FTI consulting, he is believed to have returned home to Ireland and sought pioneering treatment in Germany following his diagnosis, reports the Irish Independent.

The couple started dating in September 2013 after being introduced by Downton co-star Allen Leech

Despite their best attempts to keep the romance out of the spotlight, Dockery briefly let her guard slip in September 2014, saying: "I have a wonderful man in my life from Ireland."

Marymount hospice where Dineen died on Sunday morning specializes in palliative cancer treatment.

Just last week the actress was in the United States to make press appearances for Downton's final season, before quickly jetting back to the UK to be by Dineen's side. She was spotted arriving to London's Heathrow airport on Thursday.

Downton Abbey Star Michelle Dockery Devastated After Fiancé Dies of Cancer at 34| Death, Michelle Dockery

Michelle Dockery at Heathrow Airport

FameFlynet



Dockery seemed to be in good spirits while visiting PEOPLE Now, The Late Show with Stephen Colbert and Watch What Happens Live with some of her cast mates.

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