A 17-year-old boy has died at Polmont Young Offenders Institution two years after the government pledged to stop sending under-18s to the facility.
The Scottish Prison Service confirmed that Jonathan Beadle died on Saturday. The understands he took his own life.
A fatal accident inquiry – which is mandatory for any death in custody – will be held to examine the circumstances.
A prison service spokesperson said: “Every death, whether in prison custody or in our communities, is a tragedy for all those who knew and supported the individual.
“Following the death of someone in our care, Police Scotland are advised, and the matter reported to the Procurator Fiscal. Fatal accident inquiries are held in due course.”
The 17-year-old was sent to Polmont after pleading guilty to a charge of acting in a disorderly manner and being in possession of weapons with intent to “assault and murder” a 16-year-old girl.
He had put an airgun, shovel, wrench, duct tape and rope in the boot of a car as he went looking for the girl in Moray in March last year.
While the case was ongoing, he stayed in a secure children’s unit before being moved to Polmont.