A FORMER accountant who stabbed his wife 86 times in a frenzied knife attack was today found guilty of murder.

David Lilburn was fuelled by rage after 43-year-old Ann vowed to leave him over his affair with another woman.

A 999 call heard hysterical Ann scream: "I'm dead" as her husband repeatedly plunged kitchen knives into her.

Scheming Lilburn tried to con a jury at the High Court in Glasgow claiming he was mentally unwell and a "black shadow" had ordered him to stab Ann.

But they dismissed his lies and found him guilty of murdering his wife at their Paisley home in the early hours last July 29.

Lilburn, 45, will be sentenced to life when he returns to the dock in September and told the minimum term he must serve.

The court had heard Lilburn embarked on an affair with 43-year-old divorcee Lynn McGuire after answering her advert in a lonely hearts column.

He had earlier paid £2000 to a private detective to find a former female schoolmate, but she turned him down.

Lilburn told the court his womanising led to the "complete destruction" of his loyal wife and his kids lost respect for him.

But he still wined and dined McGuire, treating her to five-star trips and meals in restaurants.

Ann, a Catholic, eventually consulted lawyers about a divorce.

Lilburn was later sent a letter demanding he leave the family home in Arniston Way.

This left him fuming - and eventually led to the brutal attack on his wife.

Lilburn had gone to sleep in the marital bed, despite it being agreed he use a spare room. He had earlier been out celebrating his birthday with Ms McGuire.

The court heard his wife came home and a row erupted. Raging Lilburn repeatedly banged her head against a door frame and floor.

Lilburn stormed downstairs and grabbed four knives from the kitchen before returning to stab his wife 86 times.

The jury were played the 999 call in which Ann pleads for Lilburn to stop. She also screams to the operator: "I'm dead".

Moans and groans are interrupted by Lilburn striking her with the blades.

After the attack, callous Lilburn stepped over his wife's blood soaked body and went for a shower.

Lilburn told police he had no memory of any attack, but during the trial he admitted killing his wife and that a mysterious "black shadow" had telepathically told him to.

His QC Andrew Lamb asked the jury to convict him of the lesser charge of culpable homicide on the grounds of diminished responsibility.