Post mortem examinations will be carried out later on the bodies of two men who were found dead in Co Carlow yesterday morning.
The remains of 71-year-old George Rothwell were discovered first after a fire at his farm in Ballycormac near Bagenalstown.
He is understood to have died of gunshot wounds.
Hours later, the body of a second man, 52-year-old Michael Jordan - who was married to Mr Rothwell's sister - was found in a building on an adjoining farm.
Gardaí are examining the possibility that the two men may have been involved in a family dispute over land.