Local sources have suggested the victim was recently acquitted of abuse allegations.
A man is being questioned about the discovery of a body in Mayo.
He was arrested on suspicion of murder following a house fire in Castlebar yesterday.
The victim has been named locally as 83 year old John Brogan.
Emergency services were called to the scene of a fire at a house on Pheasanthill in Castlebar shortly after 6.30 yesterday evening.
Mr. Brogan's body was discovered inside the house - with reports he had suffered a number of gunshot wounds.
Local sources have suggested Mr. Brogan was recently acquitted of abuse allegations.
Gardaí have since arrested a man on suspicion of murder, who's being questioned at Castlebar Garda Station - and the services of the State Pathologist have been requested.
Anyone with any information in relation to the case is urged to contact any garda station or the Garda Confidential Line.
Tens Of Thousands Celebrate At Dublin Pride Parade
National Homelessness Figures Drop For First Time In Months, With Decrease Also Seen In Kildare
Report Finds Improvement In Inpatient Mental Health Services
Status Yellow Thunderstorm Warning For Kildare And Other Counties Today
Man Accused Of Woman's Murder Near IPAS Centre Dies In Prison
Temperature Warning Extended Until Saturday
Ireland Could See Hottest Day In 140 Years Today
Kildare Minister Says Ireland Is At "Critical Moment" In Relation To AI
