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.
Possible job cuts at RBSI in Guernsey and Jersey
The bank says it is simplifying operations as finance becomes increasingly digital.
Guernsey students beat England's A level pass rate
Guernsey students performed slightly better in A-Levels than their English peers.
Guernsey community unites out west for solar eclipse
Thousands of islanders basked in the August heat to watch the once-in-a-generation partial solar eclipse.
19 months of traffic lights on busy Guernsey road
The Charroterie will have temporary lights from the end of August till March 2027 to enable 70 new flats to be built.
New Dean of Guernsey has Alderney connections
Matthew Trick will be installed as the Dean of Guernsey in late September having recently been Alderney's locum priest.
Guernsey's youngsters concerned by the high cost of living
The latest Public Health report shows a significant number of 16-24 year olds are put off staying on the island because of cost pressures.
A solar eclipse and meteor shower over Guernsey tonight
Guernsey's west coast will experience 94.5% totality as the moon obscures the sun.
Average Guernsey home selling for more than £600,000
Rent prices slow but are still up 34% over five years.
