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.
Average rent in Guernsey up 45% over five years
Local market rents now average just under £2,200 a calendar month.
Mariners reminded to respect Alderney’s Puffin Friendly Zone
Burhou's exclusion zone is in force to protect breeding puffins after winter storms devastated their population.
Hollywood crew find Guernsey talent for upcoming Occupation film
Two Guernsey actors have successfully auditioned for speaking parts in the film 'Under the Watchful Gaze.'
Ombudsman issues advice about mis-sold car loans
The Channel Islands Financial Ombudsman says the compensation for car loans that is being offered in the UK does not apply to people in Jersey and Guernsey.
'Music Muratti' for young musicians in the Channel Islands
Aa new inter-islands battle of the bands competition, being dubbed a 'Music Muratti' has been organised for young musicians across the Channel Islands.
Man charged following a bomb scare in a Guernsey nightclub
Police have charged and bailed a 33 year old under a Terrorism Law offence after an alleged incident at Folies nightclub.
Guernsey FC's play-off final to be held at Victoria Park
Guernsey FC will officially be able to compete for promotion on home soil, after league's U-turn.
Guernsey celebrates 81 years of Liberation
The main focus is on St Peter Port with some 20,000 people expected to come and go during the day.
