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.
Closure ongoing at Guernsey's leisure centre
A major effort continues to trace the source of Legionella bacteria and then stop it happening again.
Guernsey's leisure centre closed for another day
The long term solution is the installation of filters to stop Legionella bacteria getting into the water system.
Health authorities to consider 'cot cams' recommendation
A call for video monitoring of babies in neonatal cots and incubators will be considered by both Jersey and Guernsey's health authorities.
Guernsey tax backlog 'worse than thought'
Guernsey's tax backlog is worse than thought and will take two years to clear, an update on the troubled Revenue Services has revealed.
Warning issued over smart glasses use
People who use smart glasses are being urged to act responsibly and consider the impact on other people's privacy.
£22m Children's Services hub plans advancing
Guernsey's States will be asked to approve a new hub for Children's Services, costing up to £22 million.
Electricity companies sign four-year deal with EDF
Jersey and Guernsey Electricity have signed a new four year deal with French energy supplier EDF.
14 secondary Asian hornet nests found in Guernsey
Five separate Asian hornet nests have been traced and eliminated in the space of one week.
