Gardai seek anyone in contact with father and son involved in tragic Xmas murder-suicide

Daniel Duffy, aged 88 and his son Damien, aged 50 were found dead at their Letterkenny home on the afternoon of December 23rd.

Mr Duffy Snr was found inside the home while his son was found in a car in a shed at the rear of the house at Windyhall.

It is understood Gardai are working off the theory that Damien smothered his father and then took his own after being poisoned by carbon monoxide in his car.

The results of a post mortem carried out on Christmas eve by the state pathologist's office have not yet been released.

Milford-based Garda Sergeant Niall Maguire said they are seeking any drivers who may have been in contact with either men.

"We would like anybody with any information on this incident to come forward.

"In particular anybody who spoke with either male in person or by telephone or who provided transport or taxis who may have called to the house at Windyhall, Letterkenny on the 22nd or 23rd or December to please come forward.

"If you can help us, specifically people who may have spoken to them or may have given them lifts on the 22nd or 23rd of December then please contact the Gardai in Letterkenny.

"We need to investigate as thoroughly as we can so we can assist the professionals in the future to prevent something like this from happening again," he said.

Both men were buried together in Mr Duffy's native Ramelton following their funeral mass at St Eunan's Cathedral in Letterkenny.