A GLASGOW man who murdered a teenager by stabbing him through the heart has died in prison.

According to The Daily Record, Francis Docherty, 57, died on Sunday while serving his sentence at HMP Perth. 

The newspaper reports that he was sentenced at the High Court in Glasgow in 1987 after he was found guilty of killing David Ferns.

In the lead up to the murder, had been arguing with the 16-year-old's older brother when the pair were out walking their dogs.

David arrived to help his sibling during the argument between them.

He was then fatally stabbed through his heart by Docherty.

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Castlemilk man Docherty, who lived in Bogany Terrace, was previously reported missing from at HMP Edinburgh, then known as Saughton Prison in 2004.

Prison staff had raised the alarm after he had failed to return from a work placement at a charity shop. An image was released by the police to find him at the time. 

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A spokesperson for the Scottish Prison Service confirmed the death online.

The spokesperson said: "Francis Docherty, 57, a prisoner from HMP Perth has died on January 23. He was sentenced at Glasgow High Court in 1987.

"Police Scotland have been advised and the matter reported to the Procurator Fiscal.

"A Fatal Accident Inquiry will be held in due course."