Specialist officers are examining a property in Mill Street following an 'unexplained death'.
Officers carried out a welfare check this afternoon (10 December) at a flat on Mill Street.
They found a deceased man inside, believed to be 53 years old.
A crime scene cordon is in place, and detectives want to speak to anyone with information.
The Criminal Investigation Department can be contacted on 01481 222 222.
Guernsey’s German Occupation Museum marks 60 years of preserving wartime history
A plaque will be unveiled at Guernsey's German Occupation Museum commemorating its 60th anniversary.
Man jailed for using everyday items to smuggle drugs into Guernsey
35-year-old Gino Pallisco has been sentenced to more than nine years in prison for the importation of drugs.
£16.5M to clean PFOS contaminated soil at Guernsey Airport
Guernsey's States will be told the containment 'bund' is beginning to fail and the removal project needs to go ahead.
Ross Le Brun is Guernsey's new deputy-elect
Veteran of previous election bids wins the first island wide by-election with 953 votes.
How Guernsey is celebrating 81 years of Liberation
Events are taking place across the island to mark the 81st anniversary of the end of the German occupation.
Polls open in Guernsey's first island wide by-election
Eleven candidates are standing for the single vacant seat in the Assembly.
Iran effect looming in Guernsey's latest inflation figures
RPI has risen to 4% for the three months ending March.
Alderney to explore data centre hosting
A study says data hosting could make substantial money for the island through leases and royalties.
