The body of the male in his 60s was discovered in a house at Dun Saithne Green in Balbriggan, North Co Dublin, at around 2pm Wednesday afternoon.
The remains were found by a concerned relative, it is understood.
It is believed the man, who it is understood to have lived alone, may have died violently amid reports he had sustained visible injuries.
A Garda spokesperson said: “Gardai are investigating the discovery of a body of a man in unexplained circumstances in North Co Dublin on Wednesday afternoon.
“Gardai attended a domestic residence in Balbriggan where the body of a man in his 60s was discovered.
“The scene was preserved and a technical examination was carried out by the Garda Technical Bureau.
“The office of the state pathologist has been informed."
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