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.
House Sparrows reign in Channel Island gardens in 2026
1,100 Channel Islanders took part in the RSPB Big Garden Birdwatch 2026.
Bike trailer gifted to Guernsey cycling initiative
The cycling charity Only Fools and Donkeys has given a new bike trailer to the adapted cycling initiative, Wheels For You.
Victor Hugo retail trail launches in Guernsey
Islanders can explore St Peter Port shops and see where the famous author Victor Hugo went in the 1800s.
Aurigny takes delivery of second Alderney aircraft
The Skybus Twin Otter will provide resilience on the lifeline Alderney routes.
Sections of Guernsey's main roundabout to close over 10 nights
The Weighbridge roundabout will be closed in sections overnight from 11 to 21 April to allow resurfacing.
Guernsey cyclists gear up for vital hospice fundraiser
Over the past 18 years, sponsored riders have raised nearly £1.2M for Les Bourgs.
More direct flights from the Channel Islands to Tenerife this winter
An extended programme of direct flights abroad is on offer this winter.
Guernsey film crew wanted for upcoming WW2 drama
Guernsey residents with experience of the film industry can apply for roles in a new Hollywood picture, set during the Occupation.
