Shaun Duffy, 36, was brutally battered, stabbed and even had a crossbow arrow stuck in his arm when he was attacked in Co Donegal.
Now on the seventh anniversary of his death on January 29th, 2005, his sister Karena Tooms has told Donegaldaily.com a “fresh pair of eyes” could help find her brother’s killer.
She said “Unless somebody walks into a Garda station and hands themselves in for Shaun’s murder, I don’t think his killer will ever be caught.
“I think a fresh pair of eyes could find that vital clue and lead to somebody. The Gardai have done a lot of work now but I think a new approach is needed now,” she said.
Ms Tooms said the family had not received any update from Gardai since Shaun’s inquest a year and a half ago.
Mr Duffy was killed when he returned home from a night out at his home in Meenacross, outside Dungloe.
An undertaker and a horse-dealer, he was well-known in the area and his murder sent shockwaves through the local community.
More than 1,000 people were interviewed and more than 800 statements taken in a massive manhunt by up to 50 Gardai who worked on the case.
Sister Karena still believes that somebody locally knows who killed larger-than-life Shaun who weighed 19 stone and was well over six feet tall.
Gardai that two men may have been lying in wait for Mr Duffy to return home from a night out.
“I believe it was somebody from outside who was brought in to murder Shaun.
“But I know they had to have local help and knowledge. They knew his movements and where he lived. Somebody helped them kill Shaun,” she said.
A Garda spokesman said the case of Shaun Duffy is still open and appealed for anyone with any information to contact them.