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.
'Pause before paying' to avoid being scammed, islanders urged
Financial regulators in the Channel Islands are urging people to take extra care before sending money or sharing financial information.
Five Guernsey firefighters injured while travelling to assist with Sark fire
An update from emergency services confirms that five Guernsey firefighters received "non-life-threatening injuries" shortly after arriving in Sark.
Emergency response to fire on Little Sark
Sark's government says it is responding to an ongoing incident believed to be a fire in an area of undergrowth near the island's abandoned silver mines.
Hospitality sector calls for Guernsey's States to make savings before GST
Members of the Guernsey Hospitality Association are concerned a consumption tax could make doing business more expensive.
Bailiwick's underwater wonders highlighted on new stamps
Underwater shots from a Sark-based photographer will be sent around the world on new postage stamps.
"Heightened risk" of wildfires in Guernsey
As the third heatwave of the year sears the island, people are told to be careful about causing a fire inadvertently.
Guernsey anti-GST protest gains momentum
Two anti-GST rallies, one billed as a 'strike', will take place ahead of July's tax reform debate.
Cameras to roll on new Guernsey Occupation film in February 2027
Hollywood producer Gene Fallaize talks exclusively to Island FM about the difficulty of making a major film on island.
