Investigating officers sealed off Kenny’s Bar in Oughterard following the discovery of John Kenny’s body yesterday by family members.
The pub had not been opened during the day.
The state pathologist, Professor Marie Cassidy, is due to carry out a preliminary post-mortem today in an effort to find out how Mr Kenny died.
Mr Kenny, whose family has run the pub in the busy angling town of Oughterard, on the shores of Lough Corrib for years, also worked as a teacher in Presentation College in Athenry.
Mr Kenny, who was in his 50s, is the son of a former garda. He has one daughter and a number of siblings who live in the area.
The pub opened on an occasional basis in the town, which is about 35km west of Galway city.
Gardaí sealed off the premises after Mr Kenny’s body was discovered there at about 6pm yesterday. A spokesman confirmed they are treating the death as “suspicious”.
Independent Galway county councillor Thomas Welby, who knew Mr Kenny well, said the community was stunned by his death.
“He was born and reared here, he was well-known in the locality, and so this is a very big shock to the community,” said Mr Welby.
Gardaí have appealed for anyone who was in the pub over the weekend to contact them on 091 538000.