A man from Axminster was found 'unresponsive' on a motocross track in Dorchester on Saturday (April 6).
Dorset Police received a report of an incident at Higher Ashton Farm off the B3159 Goulds Hill, Martinstown. A rider was found unresponsive.
Officers and the ambulance service attended but, the 54-year-old was pronounced dead at the scene.
His next of kin has been informed and the coroner was notified.
The incident is not currently being treated as suspicious, but officers are looking into the circumstances.
Police Sergeant Chris Brolan, of the Roads Policing Team, said: “First and foremost, our thoughts are with the loved ones of the man who tragically died.
“We are trying to establish what exactly happened. The event took place on farmland and was not a race.
“It is believed that over 60 people took part and we are hoping that someone may have recorded footage that could assist us with our investigation. I would urge anyone who used a helmet camera or any other device to please check if they have caught anything of relevance.”
Dorset Police are now appealing for witnesses or footage of the motocross event.
Anyone with information is asked to contact Dorset Police at www.dorset.police.uk, via email at scit@dorset.pnn.police.uk or by calling 101, quoting incident number 6:166. Alternatively, independent charity Crimestoppers can be contacted anonymously online at Crimestoppers-uk.org or by calling Freephone 0800 555 111.
Comments: Our rules
We want our comments to be a lively and valuable part of our community - a place where readers can debate and engage with the most important local issues. The ability to comment on our stories is a privilege, not a right, however, and that privilege may be withdrawn if it is abused or misused.
Please report any comments that break our rules.
Read the rules here