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Richard Molloy, 33, as well as his two friends Declan Carson and Aaron Callaghan, travelled to Marmaris to have their teeth whitened.
However, Molloy has now died, and the other two North Belfast residents were left fighting for their lives in hospital.
There is no evidence the dental work is responsible for the death of Molloy and the other two men's illness. They were discovered unconscious in the rented property they'd hired for their visit.
Carson and Callaghan have been reported to be in comas, but their condition is thought to have improved slightly.
Molloy's body will be brought back home to Northern Ireland by the Kevin Bell Repatriation Trust.
Colin Bell, a spokesperson for that organisation, told the Belfast Telegraph: "It's a very difficult situation. The young fellow died out in Turkey after travelling with his two friends.
"I understand they had been travelling out for dental treatment, we don't know how it happened but it ended up with Richard dying and the other two lads being seriously ill."
He continued: "At this stage his sister has flown out and she's been put in touch with the funeral company who are looking after Richard's repatriation."
The day before the men were discovered in their holiday flat, Mr Callaghan had shared a photograph of the three enjoying the sunshine and sea in Marmaris, writing: "How's your Friday?"
Since the death, friends of Molloy have paid tribute to him online, with one person writing: "We'll never get over you Richie."
Another person commented: "R.I.P. Ritchie true gentleman."
A third friend wrote: "I love you Richie. Our bro forever!"
Mr Callaghan was a former player for the St James' Swifts football club, and they took to Twitter to wish their ex-player a speedy recovery.
The club said: "Our thoughts and prayers go out to former first team player Aaron Callaghan today.
"Everyone at the club are thinking of you during this time and we have both you [and] your friends within our hearts."
Our thoughts and prayers go out to former first team player Aaron Callaghan today.- St. James Swifts (@stjamesswifts) October 4, 2020
Everyone at the club are thinking of you during this time and we have both you are your friends within our hearts :yellow_heart: pic.twitter.com/qReauC3yNl
A spokesperson for the Foreign and Commonwealth Office said: "We are supporting the family of a British man who has died in Turkey and we are in contact with the Turkish authorities."
The Republic of Ireland's Department of Foreign Affairs is also providing consular assistance as two of the men travelled on Irish passports.
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