Gardaí have launched a murder investigation following the discovery of a man's body at his home in Dublin on Wednesday.
The victim has been named as 65-year-old Christopher Hall.
Gardaí received a 999 call on Wednesday to attend a house in Balbriggan, where it was reported a man's body had been found.
Officers discovered the body of Mr Hall downstairs in the house with "obvious significant head and upper body injuries".
He was pronounced dead at the scene.
Gardaí say Mr Hall lived alone at the house, and was vulnerable due to a medical condition.
A senior investigating officer has been appointed and an incident room has been set up at Ballbriggan Garda station.
The house remains sealed off pending an ongoing technical examination.
His body has been removed to the City Morgue, where a post mortem is being carried out.
Gardaí say the results of this post mortem will assist in the direction of the investigation.
Superintendent Paul Franey says the investigation team is continuing with CCTV and door-to-door enquiries.
"I am appealing to any person who was in the Dun Saithne Green, Dun Saithne Crescent or wider Dun Saithne area between 8.00pm Tuesday 23rd November and 2.00pm Wednesday 24th November - whether you believe you saw anything of interest or not - to contact Balbriggan Garda station.
"I want to appeal to residents or persons with cars parked in the Dun Saithne area who may have CCTV or dashcam footage, if Gardaí have not been in contact with you to please come forward with that footage.
"Finally, I am appealing to anyone with any information on the murder of Christopher Hall to contact investigating Gardaí at Balbriggan Garda station on 01-666-4500, the Garda Confidential Line at 1800-666-111 or any Garda station."
