A man who murdered his teenage son after knifing him through the chest over two decades ago has died in jail.
Edward Simpson had been serving a sentence at HMP Castle Huntly near Perth where he was found dead on Friday, March 18.
The 55-year-old was found guilty of the brutal killing of his 18-year-old son, also named Edward, in November 2001.
He was sentenced to at least 10 years behind bars at Glasgow High Court the following year.
During the trial, the monster revealed no shame as jurors heard how he laughed: "Ha ha ha. Was that sore, you wee p****? I hope it was sore" after pushing the knife through his son's body.
Edward junior's girlfriend, little brother and sister looked on as the horror unfolded outside their Clydebank home.
Brave brother Sean, then 11, held both hands over the wound in an effort to stop Edward junior from bleeding to death.
During the four-day trial, the court heard that the argument broke out after Edward junior had fled home after a fight.
Drunken Simpson had been singing carols with his younger children with a large knife placed in the waistband of his trousers.
The pair were caught up in a dispute before terror spilled into the street.
Remorseless Simpson showed no emotion as Lord Emslie sentenced the killer to 10 years.
It is understood Simpson died of natural causes.
A Fatal Accident Inquiry (FAI) will be carried out in due course to establish the exact circumstances surrounding the death.
A Scottish Prison Service (SPS) spokesperson said: "Edward Simpson, 55, a prisoner from HMP Castle Huntly has died on March 18, 2022.
"Mr Simpson was sentenced at Glasgow High Court in 2002. Police Scotland have been advised and the matter reported to the Procurator Fiscal.
"A Fatal Accident Inquiry will be held in due course."
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