A lecturer stabbed his wife to death in a 'stabbing frenzy' because he wrongly believed he was not the father of their children, a court heard.

Robert Kerr, 39, attacked Xin Xin Liu, 39, at their home in the upmarket suburb of Newton Mearns, near Glasgow, in April as their two sons slept upstairs.

He stabbed his wife more than 70 times before making himself a hot drink as she lay dead on the floor, it was heard.

'Stabbing frenzy': Lecturer Robert Kerr, 39, attacked Xin Xin Liu, 39, at their home in the upmarket suburb of Newton Mearns, near Glasgow, in April as their two sons slept upstairs

Prosecutor Jane Farquharson said Kerr had 'suspicions' that a friend was the father of his children when he attacked his wife at their home, pictured at the time of the killing

He later phoned 999 and said: 'I have just killed my wife. I murdered her in a stabbing frenzy,' adding, 'there is blood all over the place'.

Kerr later told officers: 'I found out tonight they were not mine.'

The lecturer faced a murder allegation as he appeared at the High Court in Glasgow today but prosecutors instead accepted his guilty plea to the reduced charge of culpable homicide on the grounds of his diminished responsibility.

It had been concluded that Kerr was suffering from 'an abnormality of the mind' at the time of the attack.

A group of Xin Xin's relatives were in court yesterday, with some weeping as the horrific details of her death were revealed.

Ms Liu moved to Scotland from China 15 years ago to study law at Aberdeen University, where she met Kerr. The couple married in 2003.

Kerr later became a lecturer at West College Scotland, in Paisley, while his wife was training to become a translator.

The couple were described as 'quiet and private' and family said they were not aware of any problems in their relationship.

Kerr stabbed his wife more than 70 times before making himself a hot drink as she lay dead on the floor of their home. Pictured, forensics at the house following the killing

The court heard that weeks before the killing Kerr had contacted his GP complaining of stress caused by 'work and personal issues'.

He said he was suffering from anxiety, insomnia, and spoke about 'paranoid feelings'.

Prosecutor Jane Farquharson said Kerr had 'suspicions' that a friend was the father of his children when he attacked his wife.

A paternity test recently carried out has confirmed that he is the father, she said.

A post mortem later revealed Xin Xin had suffered approximately 76 wounds.

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

One doctor concluded that 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.