A father who killed his four-month-old baby son by shaking him in a fit of rage has been jailed for more than seven years.

David Sinclair, 34, a supermarket worker, previously admitted the culpable homicide of his son Joshua at the family home in East Kilbride, South Lanarkshire, on December 6, 2012.

Sinclair compressed the chest of his baby boy, seized hold of him and shook him repeatedly.

The killer then inflicted "blunt force trauma" to Joshua, who was left so severely injured he later died.

He returned to court on Friday to learn his fate and was jailed for seven years and three months by judge Lord Bannatyne.

He told Sinclair: "You assaulted your baby son by shaking him, causing the injuries which killed him.

"You must have known at the time you had shaken him but you did not disclose that. It was only after extensive medical investigations you admitted what you had done.

"Your wife believed in you. She now feels she had been misled by you and can no longer support you."

Four days before the birth of his son, Sinclair went to his GP saying he felt depressed and angry with an urge to lash out. He was prescribed an anti-depressant.

Sinclair, his wife Kirsty and Joshua went swimming and then shopping in East Kilbride on the day of their child's death before Mrs Sinclair went out to meet her mother and sister at around 5.30pm.

Just 11 minutes later she received a phone call from Sinclair, telling her: "Joshua isn't breathing properly, come home right away," then hung up and dialled 999.

Sinclair was given instructions about giving Joshua CPR but when a paramedic arrived he noted that he was either sitting on a chair or standing.

The court heard Sinclair claimed Joshua had made a strange or different noise that was not normal and then stopped breathing.

Joshua was taken to Hairmyres Hospital in East Kilbride and medical staff battled for almost an hour to save him.

The court was previously told a forensic examination of Sinclair's laptop established it was online from 4.19pm onwards and he was playing games on Facebook.

Defence counsel Ian Duguid QC said: "Mr Sinclair's position is he had been trying to feed his son Joshua, who was unsettled and continued to cry.

"He became so angry he shook him for approximately five seconds. It was a momentary loss of control. He loved his son and feels deeply about this.

"If this had gone to trial 12 witnesses were prepared to come forward to vouch for the fact that Mr Sinclair appeared to be a perfectly decent and proud father of his son - his first child."

Mrs Sinclair was not in court to see her husband sentenced. The pair married on the anniversary of their son's first birthday. She originally stood by Sinclair but has now said she can no longer support him.