A MURDERER who stabbed a teenage boy through the heart at a disco organised to keep kids out of trouble is back behind bars after carrying out a bottle attack at a Renfrew pub.

Scott Smith was caged for life in 2000 for stabbing fellow 16-year-old Graham Newton to death on the dance floor of a council-run bash for under-18s.

Smith kneed his victim in the groin and then plunged a knife into his heart.

He was ordered to serve a minimum of 10 years behind bars for the murder, which took place at the Ikon club in Old Sneddon Street, Paisley.

Smith, who was released back into society in 2013, is now 35 and married with a three-year-old child.

However, he has been locked up again after admitting a vicious bottle attack at Davidson’s Bar, in Hairst Street, Renfrew – a pub where his wife is the joint licence holder – on March 2 this year.

Smith casually poured lager out of a bottle before spinning it round so the neck was sticking out and smashing it into the face of Stuart Mack, leaving blood pouring from a wound which medics had to sew shut.

He held his hands up over the attack when he appeared in the dock at Paisley Sheriff Court last week, pleading guilty to assaulting Mr Mack by striking him on the head with a bottle to his severe injury.

Procurator fiscal depute Pamela Brady said Mr Mack and a group of his friends were drinking in Renfrew on the evening in question and headed to Davidson’s Bar at about 8.45pm.

She added: “The accused was in the bar and the group sat down at the side of the bar.

“They were in what’s described as ‘good spirits’.

“The accused was sitting nearby and began speaking with them and, at various points of the conversation, stated to them the pub was his pub and they better behave.

“The accused seemed to become agitated and aggressive towards the group and in particular to Stuart Mack.”

Smith then punched Mr Mack in the face, smashing the bottle into his eye at the same time.

Mr Mack was rushed to hospital, where six stitches were needed to seal a wound to his right eyelid, while the police were contacted and Smith was arrested.

Defence solicitor Rhona Lynch said Smith, who is on life-long supervision in the community as a convicted murderer, had made a go of his life in recent years.

She said Smith’s wife was the joint licence holder at Davidson’s and that he was drunk on the night in question and believed Mr Mack and his friends had been taking drugs in the pub toilet.

She added: “He presents as someone deeply and genuinely remorseful for his conduct.”

After hearing that Smith had obtained college qualifications following his release from jail, Sheriff David Pender called for background reports ahead of sentencing.

He adjourned the case until next month and remanded Smith in custody.