Ben Davies, an Oxford University graduate, was only three weeks away from his wedding day when he tragically died on the island of Mykonos.
An inquest into his death heard he fell near to his hotel after "alighting from a taxi."
Mr Davies, 32, was deputy chief of staff for the Conservative group sitting in the Welsh Government in Cardiff.
He was set to marry fiancee Emily Russ and travelled with six close friends to the party island for a stag week in the sunshine.
The inquest heard Mr Davies suffered a severe head injury in June last year and was rushed to hospital.
After initial treatment on the island he was transferred to hospital in Piraeus on the Greek mainland close to Athens.
But the inquest heard despite the doctors' best efforts he died of his injuries on July 3.
Heartbroken Miss Russ, 31, flew to his bedside.
At the time she posted on Facebook: " Positivity is the way forward!! The boy is a fighter! Probably one of the main reasons why I love him so much!"
The couple had just bought their first house together in Cardiff in preperation for married life.
Mr Davies studied history at the London School of Economics before going on to get a Master's in Russian and European Studies at Oxford.
He worked as an advisor for the Liberal Democrats in the 2010 General Election, helping Duncan Hames get elected as Wiltshire's first Liberal MP in 86 years.
But he later volunteered for the Conservatives in London before landing a job with the Tory party in the Welsh Assembly.
After his death, Cardiff Conservative councillor Jayne Cowan said: "Ben was a great figure on the campaign trail, he was very bright and very articulate.
"He had this fascinating sense of humour, you remembered when you're in his presence even if there's 10 other people there.
"He was special, it's absolutely tragic."
Coroner Graeme Hughes recorded a conclusion of accidental death at the inquest in Pontypridd.
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