The 10 mile trail race was being held at Innerleithen, Tweeddale, Scottish Borders, in good weather conditions.
The participant became unwell at 1756pm, approximately one mile into the event, close to our event control station and at the location of one of our safety marshals.
A member of our medical team was on the scene within three minutes as we implemented our response protocols.
They were assisted by an off-duty paramedic until the arrival of the Scottish Ambulance Service.
Tragically, we have since learned that the individual passed away on route to hospital.
Rat Race Adventure Sports will give full assistance to the appropriate authorities.
Our heartfelt thoughts and condolences are with the family and friends of the deceased.
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