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.
"No shortage" of flu jabs for Guernsey vaccination programme
Public health officials say there is currently no shortage of flu vaccines for those eligible under the vaccination programme - but say some community pharmacies may be low on stock.
Both winning CI Christmas Lottery Tickets sold in Jersey
The Channel Islands Christmas Lottery 2025 has announced its winners.
Guernsey women's murder trial "unlikely ever to resume"
A Guernsey family have been fighting for justice for their daughter for more than a decade.
Guernsey actor to reprise Doctor Who role for Boxing Day Dip
An intergalactic blue android will be splashing about at Cobo Bay on Boxing Day to raise money for charity.
Aurigny to fly between Guernsey and Jersey next year
The States of Guernsey-owned airline is the first to be granted a licence in the wake of the collapse of Blue Islands.
Review into healthcare complaints in Guernsey to go ahead
The new president of Health and Social Care says a review of healthcare complaints will take evidence from both sides before making recommendations.
Former CI Co-op boss awarded more than £3m
The former boss of the Channel Islands Co-op has been awarded more than £3 million from his ex-employer.
Guernsey Airport releases former Blue Islands aircraft
Guernsey Ports say the majority of Blue Islands' outstanding debt it is owed has been recovered.
