The man found dead in a burning house in Co Mayo on Sunday night has been named locally as John Brogan (83).
Another man, aged in his 60s, has been arrested on suspicion of murder.
The Garda Technical Bureau and the State Pathologist are still at the scene in Pheasanthill, Castlebar.
Brogan was a retired bachelor farmer who lived alone in the property, according to The Irish Times.
About 6.30pm on Sunday night, gardaí and emergency services were alerted to the house through reports of a fire.
The body of a man was discovered inside the residence, with some reports suggesting he may have suffered gunshot wounds.
The dead man had previously come to the attention of gardaí over alleged historic abuse offences.
The arrested man is currently detained in Castlebar Garda Station.
Gardaí say investigations are ongoing.