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.
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.
Prime Guernsey seafront location for sale
The site of the former Octopus restaurant at Havelet is on the market for an undisclosed sum.
Woman (20) arrested on suspicion of attempted murder in Guernsey
There's been an increased police presence around Victoria Avenue after a suspected attempted murder.
Last day to register for Guernsey's upcoming by election
The island's electoral roll closes at midnight on 25 April.
New citizen science project observing Guernsey dragonflies and damselflies
The Nature Commission is asking islanders to survey ponds to better understand local damselfly and dragonfly populations.
Channel Islands music school to hit global stage with Dubai launch
A team of directors from the School Of Popular Music will be jetting off to Dubai this weekend, ahead of their new studio opening.
67,000 sickness days across the States of Guernsey last year
Deputy Andy Cameron, who obtained the figures, says it shows 'absence is moving in the wrong direction.'
