A prisoner was found dead in his cell after overdosing on a cocktail of drugs.
Steven Gunn died less than a year after being jailed for breaking into an East Kilbride home where he was caught red-handed by residents.
An inquiry into the 41-year-old's death at HMP Addiewell heard he had taken unprescribed diazepam, phenazepam, alprazolam and mirtazapine shortly before he passed away in cell 26 in the jail's Lomond C wing.
His body was discovered by prison officers unlocking cells and carrying out morning welfare checks, who received no response when they tried to rouse him from his bed.
A code blue alarm was raised to alert staff, but medics found no sign of life when they arrived on the scene.
In a written report published last week following a fatal accident inquiry at Livingston Sheriff Court, Sheriff John A MacRitchie explained that Mr Gunn had a history of drug abuse and staff suspected he was taking unprescribed medication.
He was moved to Lomond C wing in an attempt to interrupt his access to the drugs just weeks before his death.
However, this was ineffective and a post mortem later confirmed multi-drug intoxication and ischaemic heart disease as the cause of his death. Prescribed methadone and pregabalin were also in his system.
It found the unprescribed drugs had a respiratory depressant effect on Mr Gunn’s breathing placing further strain on his already diseased heart.
A prison officer later found a package containing unprescribed fast acting tranquilliser alprazolam tablets while clearing Mr Gunn’s cell.
A police investigation failed to identify the source of drugs that led to the tragedy in October 2018, despite extensive investigations.
Sheriff MacRitchie's judgment explained: "From the evidence, Mr Gunn was assessed regularly by and engaged well with medical and prison staff in relation to his drug addiction. There were no indications that Mr Gunn had any thoughts of deliberate self harm.
"Mr Gunn had previously used unprescribed drugs in addition to his prescribed medication as he felt unable to refrain from taking such unprescribed drugs.
"On the day preceding his death Mr Gunn appeared to be in “good spirits” when meeting with family members. After this visit prison staff who interacted with Mr Gunn also assessed him as being his “normal self” and had no concerns about him.
"Mr Gunn had not consumed all of the unprescribed drugs available to him, in that the said alprazolam was discovered after his death in his cell. It is probable in considering the entirety of these circumstances that Mr Gunn had accidentally fatally overdosed in consuming the said unprescribed diazepam, phenazepam, alprazolam and mirtazapine."
Sheriff MacRitchie also found that no precautions could reasonably have been taken that would have prevented Mr Gunn's death.
He added: "The medical and general treatment of Mr Gunn was adequate. While the said unprescribed drugs should not ideally have been available to Mr Gunn in a secure prison environment, despite extensive police investigations the source of these unprescribed drugs taken by Mr Gunn and those found in his cell after his death could not be ascertained. "
Mr Gunn passed away in October 2018 after being jailed just 11 months earlier at Hamilton Sheriff Court for breaking into the property in East Kilbride in August 2017.
He broke into a house in Ballantrae, Stewartfield, in the early hours and stole a set of car keys.
The front door was smashed with a large brick and the keys to a Ford Fiesta were taken from a sideboard in the hall.
During the disturbance the homeowners, a couple in their 60s, along with relatives in their 20s were woken and one have-a-go hero occupant managed to pin Mr Gunn down until cops arrived.
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