Police say the man, who's not yet been named, died at around 6.40pm on 18 September.
Police say the 66-year-old died in a single vehicle accident on the track to Fort Clonque, at Alderney's south-western tip.
They say as investigations are carried out there will be a police presence in the area and ask people to stay away.
Les Vardes to increase Guernsey's water storage capacity
Deputies vote to turn the quarry into the next reservoir while rubble and builders' waste will be dumped near the Longue Hougue reclamation.
150 tonnes of food waste going to landfill in Guernsey
Guernsey Waste says its food waste processing plant has been out of action since 21 April.
Bed blocking leads to longer surgical waiting times in Guernsey
The latest report into the MSG's performance shows increased demand in the health sector and inadequate resources to deal with the pressure.
Seasonal beach restrictions for dogs and horses begin again in Guernsey
Dogs and horses are banned from several beaches around Guernsey during the busy summer season.
Occupation artefacts feature on new Guernsey stamp series
Stamps commemorating 80 years of freedom from German Occupation will be released by Guernsey Post.
Let wildflowers grow: CI gardeners key to pollinator recovery
An annual campaign is urging islanders to put their lawnmowers away in May.
Bergerac will return to Jersey for second series
Damien Molony is returning to Jersey as Bergerac. UKTV teases what the TV detective will do next.
Deputies warned that Guernsey's minimum wage is lagging behind Jersey's
Guernsey's adult minimum wage will increase to £12.60 an hour from October 2025, while the rate for 16 to 17 year olds will be 90% of that figure, £11.35 an hour.
