A lecturer killed his wife in a "stabbing frenzy" after wrongly believing he was not the father of their children.

Robert Kerr attacked Xin Xin Liu, 39, at their home in the upmarket suburb of Newton Mearns in East Renfrewshire in April.

He stabbed her more than 70 times as his two sons slept upstairs and went on to make himself a hot drink while she lay dead.

Kerr appeared at the High Court in Glasgow on Monday charged with murder.

Prosecutors accepted his guilty plea to the reduced plea of culpable homicide on the grounds of his diminished responsibility.

It was concluded Kerr was suffering from "an abnormality of the mind" at the time of the fatal attack.

Kerr, also 39, who is a first offender, will return to the dock in November.

A group of Xin Xin's relatives attended the court hearing and some wept as the details of her death were revealed.

The mother had moved to Scotland from China around 15 years ago to study law at Aberdeen University.

It was there she met Kerr, who was doing a computer course. They went on to get married in 2003.

Kerr was latterly a lecturer at West College Scotland in Paisley, Renfrewshire, while Xin Xin was training to be a translator.

They were described as a "quiet and private couple" with family not aware of any problems between them.

In early April this year, just weeks before the killing, Kerr contacted his GP complaining of stress in respect of "work and personal issues".

He added he was suffering from anxiety, insomnia and spoke about "paranoid feelings".

Kerr spoke to a nurse four days before the attack and said he had been feeling much better.

The attack took place on April 26 while their children slept upstairs.

Kerr dialled 999 and admitted: "I have just killed my wife. I murdered her in a stabbing frenzy." He added there was "blood all over the place".

Police discovered Xin Xin lying on the kitchen floor with a knife still in her body.

After being held, Kerr then told officers: "I found out tonight they were not mine."

Prosecutor Jane Farquharson said he had "suspicions" a friend was the father of the children.

Miss Farquharson told the court: "A paternity test recently carried out ... has since confirmed that Robert Kerr is the biological father."

A number of blood-stained items were found at the couple's house including a milk carton.

The advocate depute said: "Kerr has since admitted that he had made himself a hot drink after this incident."

A post-mortem later revealed Xin Xin had suffered a total of approximately 76 wounds.

The court heard Kerr has since been receiving treatment at the State Hospital at Carstairs.

A doctor concluded his "ability to control his conduct" that night was "substantially impaired by reason of abnormality of mind".

He was said to be suffering from a "delusional disorder" including his belief about the paternity of his children.

Judge Lord Boyd imposed an interim compulsion order for Kerr to remain at Carstairs.

The case was adjourned until November.