The Department of Foreign Affairs has confirmed that 23-year-old Aaron Toland from Derry died in yesterday's plane crash in the Thai island of Phuket.
Minister for Foreign Affairs Dermot Ahern has offered his deepest condolences to Mr Toland's family.
Mr Ahern has also offered to provide travel assistance to the families of Irish citizens affected by the tragedy.
The minister said he hoped that the three other Irish people involved in the crash would make a speedy recovery. The condition of the three has been described as serious but stable.
Mr Toland's friend Christopher Cooley from Derry, who was travelling with him, is being treated along with two other Irish citizens, John O'Donnell from Liscannor in Co Clare and his friend William Burke from Nenagh, Co Tipperary.
Speaking on RTÉ Radio's Today with Pat Kenny, Mr O'Donnell's sister, Mairead, said he and Mr Burke are lucky to be alive.
She said the two received serious burns when the plane burst into flames and are in a lot of pain in hospital.
She also said that her sister, Trisha, and Mr Burke's parents were on their way to Thailand.
89 people were killed when the plane crashed in bad weather. 55 of those are understood to have been foreigners.
Several British citizens are among the dead, according to the British embassy in Bangkok.
Citizens from Thailand, the US, Australia and France have also been confirmed dead, while Iranians and Israelis are missing, according to their respective embassies.
Both pilots were killed in the accident. 41 people survived.
Investigators have begun the task of finding out why the aircraft, belonging to the low-fares airline One-Two-Go, veered off the runway and ploughed into an embankment.
The flight recorders have now been recovered.
Many of the injured were taken to Bangkok Hospital Phuket, where five patients are in a critical condition.
The Irish Consul in Thailand has urged Irish people holidaying in Thailand to pay attention to local media and make their family and friends aware of their travel plans.
The Embassy, the Consul and Thai officials received a number of phone calls throughout the night from people concerned about Irish people travelling in the region.
Thousands of people, including a number of Irish tourists, were stranded on the Thai island last night when all flights to and from Phuket International Airport where cancelled.
The airport has now reopened and officials say commercial flights are set to resume later today.
