An avid photographer is believed to have been crushed between a digger and a wall as he took pictures of construction work.
The family of Harvey Wolfe (54), from Skerries, north Dublin, paid tribute to him, describing him as a "kind, honourable man".
The incident happened in the harbour area around midday yesterday. The unemployed former transport manager had been documenting the progress of the construction taking place at the site of a former hotel with his camera for a number of months.
It is understood he was taking pictures at the time of the tragic incident.
Eyewitnesses said emergency services attended the scene quickly, and spent around 30 minutes trying to resuscitate Mr Wolfe, but to no avail.
Mr Wolfe's mother, Patricia, and father, Jack, paid tribute to their son yesterday evening. He is also survived by his sister, Lynn, and brothers John, Peter and Ken.
"I keep expecting him to come home," said Patricia. "I suppose that's nature's way to help you get over it, that you don't take it in."
"He was kind to everybody. He rang me or I rang him every day of life," said Jack.
"He was very honourable," added Patricia. They said Mr Wolfe loved motorcycles and last year took a road trip through the south of France.
They added that since he lost his job around three years ago he filled his time by taking an interest in the construction down by the harbour.
"He was taking photographs of the work-in-progress all the time," said Jack.
"He had a great relationship with the workmen. They all knew him," added Patricia.
Felix O'Hare Contractors was the company that had been carrying out the construction work at the harbour.
Managing director Gerry Gray yesterday extended his "sincere and heartfelt condolences to the family".
"We are completely shattered as a result of this unfortunate accident," he said.
A spokesperson for the Health and Safety Authority confirmed an investigation has been launched.