Prosecutor Derek Ogg QC described former accountant Lilburn, who is accused of stabbing his wife Ann to death, as a “calculated” individual who “pulled the wool” over people’s eyes. And he said Lilburn’s claim that a “black shadow” told him to stab 43-year-old Ann was a “convenient excuse”.

Mr Ogg addressed the jury at the murder trial at the High Court in Glasgow yesterday during his closing speech and said the loss of Ann was “a destruction of life”.

He added: “Ann Lilburn’s life was taken in a most brutal and furious manner and with such force by the accused that he penetrated the ribs and skull.

“It was with such completeness that death would happen. That could only be what he intended.”

The advocate depute said the defence case hinged on Lilburn’s mental health at the time of the offence.

Mr Ogg added: “Although it might seem that he was fine, the defence say that he faked his own sanity.

“They say that, in reality, he was desperately unwell and that qualified people got it wrong.

“But the Crown case is more old fashioned. We are looking at a man having an affair who was going to lose it all.

“His wife, who had stood by him through her struggles with ME, had finally had enough and this was the last straw.”

Mr Ogg went on: “You are going to be asked to accept evidence from a man who can pull the wool over the eyes of other people.

“He has manipulated the facts to fool professionals. However, he did not fool us and he stumbled and fell through his prepared case.”

The prosecutor concluded: “He is clever enough, manipulative enough and has the intelligence to put together this latest get out of jail free card.

“However, it stops here in this courtroom. I invite you to convict this man of every last letter of this charge.”

Lilburn, 45, denies murdering his wife by repeatedly striking her on the head, seizing her by the arm and repeatedly striking her on the head and body with knives at their home in Arniston Way, Paisley, in the early hours of July 29 last year.

Yesterday, his QC Andrew Lamb told the jury there was “no doubt” the accused killed his wife and said the only issue was his mental health at the time of the offence.

Mr Lamb said: “The fact of the matter is that, according to David Lilburn, he was persuaded by the ‘black shadow’ to kill his wife.”

The QC told the jury that, if they believed Lilburn’s account of events, they should convict him of the lesser charge of culpable homicide.

Before yesterday’s closing speeches, a psychiatrist told the court that Lilburn’s mental health problems could have affected him on the morning of Ann’s death.

Dr Srikath Nimmigadda – the final witness – said he had met with Lilburn and judged that he satisfied the “criteria” for diminished responsibility.

But he later accepted that, in forming an opinion on Lilburn, he had not consulted the accused’s GP or the psychiatrist who had been treating him.

Prosecutor Mr Ogg said to Dr Nimmigadda: “Your opinion is that he was very likely suffering because he was not taking his medication and that the black shadow told him what to do but the only source is David Lilburn.

“If he is lying to you, to fool a psychiatrist, then that is all he has to say.”

The doctor replied: “I asked him many questions. I was convinced by his answers.”

Judge Ian Peebles QC will complete his charge today before the jury are sent out to consider their verdict.