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.
Guernsey's new harbour berth endorsed by operator
The Cross Berth at the White Rock is praised by Islands Unlimited for its ease of access on all tides.
Guernsey man builds and flies his own plane
After 8 years of building it in his garage, Colin Matthews has finally been able to pilot his kit plane.
1.7M journeys made with Stagecoach in first year of Guernsey service
The UK’s largest bus operator, Stagecoach, took over from CT Plus in April 2025.
Hottest day of the year so far across the Channel Islands
Temperatures in Jersey will hit the mid 20s but a couple of degrees less in Guernsey.
Fire at Guernsey's landfill site
Crews spent around three hours tackling, and then damping down, the blaze.
Alderney's breakwater fenced off ahead of repairs
A detailed inspection has found a series of failures that will need to be fixed before allowing pedestrian access.
Guernsey castle to host 150 performers
A free live local music will return to Castle Cornet this summer.
Trial of man accused of Sarah Groves' murder could resume
Sarah Groves' family say the hurt of her loss gets worse, years after her death.
