Gardai seal off the apartment where the body was found at Lower Main Street.
The man found dead at an apartment in Letterkenny has been named locally as Bogdan Michalkiewicz.
The victim, who was in his early 40s, was found at River View apartments after suffering a number of injuries.
Donegal Daily understands the victim was stabbed.
Gardai are so far remaining tight-lipped abut the cause of death other than saying it is suspicious.
The dead man was found around 11am by his brother Tomasz, 31.
A full post mortem was due to be carried out last night to establish the cause of death.
Mr Michalkiewicz was part of a group of workers who found themselves stranded when they arrived in Ireland from Poland in 2005.
The men arrived here with the promise of three months’ work but found themselves stranded without jobs or money.
The 13 Polish and four Latvian men, ranging in age from 18 to 54, had travelled to Letterkenny after accepting an offer of work on a building site.
But after a week they were told that there was no more work.
The dead man’s brother, who found him yesterday, told of their plight at the time.
Tomasz Michalkiewicz, 31, said at the time “We came here to work for three months and now we are told there is no more work for us. We are very hungry. We do not have money even for board.”
The men, who spoke little or no English at the time, had yet to be paid for the work they had done and had no money for accommodation or food.
The men’s plight was raised by hostel owner, Karen McGlinchey who cancelled a week-long holiday in the Canary Islands so she could help at the time.
“They were left high and dry with no-one to turn to. These are people who came here on the understanding that they had work for three months. They are not looking for handouts,” she said.
The hostel was flooded with calls from all over the country with 100 job offers for the men, while a steady flow of people called with gifts of cash.
“The generosity of people has been absolutely amazing,” said Ms McGlinchey.
At the time Mayor of Letterkenny, Dessie Larkin called on the Department of Enterprise, Trade and Employment to introduce safeguards to protect the rights of foreign workers who find themselves unexpectedly without employment.
Last night Cllr Larkin, who is again Mayor of Letterkenny, said he remembered the situation well and was very sad for Mr Michaelkiewicz and his family.
“He came here and made his home here against the odds. I’m very sad to hear that he died in such tragic circumstances.
“I would appeal to the community in Letterkenny to tell the Gardai if they know what happened to him. Our thoughts and prayers are with his family,” he said.