The parents of a young man stabbed to death at a Valentine's Day party say they are furious with the State for refusing to bring charges against their son's killer.
Kieran Monahan (21) died from knife injuries following the attack at a house in Kilkenny city in 2012.
A 35-year-old man was arrested at the scene after he was discovered clutching a bloody knife.
However, a decision was made not to prosecute after the suspect claimed he was defending his home under the Criminal Law (Defence and the Dwelling) Act 2011.
The act came into operation in January 2012, just one month before the stabbing.
Now Mr Monahan's family have spoken out for the first time to demand a total review of the investigation and decision not to proceed with a trial.
Mary Monahan said there are "many unanswered questions" that remain about her son's death.
"He didn't deserve to die the way he did, I'd like to see something done about it," she said.
"We don't know the full circumstances, because we have been told too many stories by so many different people."
The grieving mother said her family has been left devastated by her son's killing. "Since Kieran died, our hearts have been broken. It should not be a parent who buries their child," said Mrs Monahan.
"Kieran has missed so much. He has two nieces now and a nephew who he will never see grow up."
Asked what she wants now, Mrs Monahan said: "I would like to see the person that stabbed my son to death prosecuted in some form. We want justice for Kieran."
A Garda spokesman said: "The death of Kieran Monahan was fully investigated and a file sent to the DPP who directed no prosecution in the case."