The man who was shot dead at a house in the West Tipperary village of Golden on Wednesday morning is understood to be from Clonmel.
Several men are believed to have gone to the house at around 6.45am and fired shots at two men who were inside.
A 30 year-old man was taken to South Tipperary General Hospital in Clonmel, where he was later pronounced dead.
The State Pathologistâ€™s Office has been informed and the scene has been sealed off.
GardaÃ have appealed to anyone with information to contact them at Tipperary town on 062-80670, the Garda Confidential Line 1800-666-111 or any Garda Station.