Yvonne Traynor was speaking after Andrew Morris was jailed for seven years for killing her son in a row over a woman.

Father-of-two Timothy Traynor (29) died after he suffered a knife wound during a confrontation outside Morris's home in Bloomhill Court last December.

In a family statement Mrs Traynor said her family had been thrown into turmoil by Mr Traynor's death with relatives finding it "almost impossible to describe the absolute devastation, pain and suffering that has now become part of their lives."

She added: "Without any thought or consideration Tim was sentenced to death when the knife entered his body, his family were given a life sentence. As a family we will spend the rest of our lives without a much loved son, brother, father, uncle, grandson, nephew and cousin. As a family we will never forget the perpetrator of this terrible crime."

Morris (28) was locked up after admitting manslaughter on the grounds of provocation.

He and his father, Kenneth Morris (56) of Lakeside Boulevard, Hyde Park, had been on trial for murder. The case, however, collapsed after a judge ruled a key prosecution witness was unreliable. All charges against Kenneth Morris were dropped.

The court was told Morris' ex-girlfriend Katie Poulson, the mother of his three-year-old daughter Isobel, had struck up a 'relationship' with Mr Traynor, who had been supplying her with amphetamines.

On the day of the attack, Miss Poulson "goaded" Morris with text messages telling him Mr Traynor was at her home developing a relationship with his daughter.

Mr Traynor, from Moorends, had previously spent time in prison for GBH with intent and had been due, in on the morning of his death, to face drugs charges.

Morris arrived home to find Mr Traynor in his house. He phoned his father, who armed himself with a hammer handle, and the pair returned. A row broke out and Mr Traynor, a pipe fitter, stripped to his T-shirt.

Michael Bethell QC, defending, said when Mr Traynor threatened to kill Kenneth Morris his son rushed into the house before emerging with the knife with which he stabbed Mr Traynor, the court was told.

Sentencing Morris Judge Michael Murphy QC said: "I hope in your life you will never experience the pain and desolation of losing a child. You thought Timothy Traynor was having an affair with the mother of your child. You have to live and be punished for the knowledge you have killed another human being."

Speaking afterwards Det Supt Bob Yates said: "Carrying knives at any point, any time, by anyone in a public place, will almost inevitably lead to violence and the loss of lives. The carrying of knives cannot and will not be tolerated."