The 72-year-old died within HMP Grampian on 13 August 2024 following a decline in his health.
Mr Duncan died while in legal custody and in the care of the state. As such his death was investigated by the Crown Office and Procurator Fiscal Service and a mandatory Fatal Accident Inquiry was held.
The Procurator Fiscal, who acts in the public interest in such Inquiry, presented evidence on the facts and circumstances of Mr Duncan 's death.
Following publication of the determination, Procurator Fiscal Andy Shanks for the Crown Office and Procurator Fiscal Service, Scotland’s independent deaths investigation authority, said:
“We note the Sheriff’s determination following the Fatal Accident Inquiry into the death of Arthur Duncan.
“The Procurator Fiscal ensured that the full circumstances of Mr Duncan’s death were presented in evidence, allowing for independent judicial scrutiny of the death while he was in legal custody.
“The sheriff concluded that no reasonable precautions or system changes could have prevented the death and made no recommendations.”
Further information
For more information on Fatal Accident Inquiries see the Crown’s guide.