A man in his 80s arrested after a shooting at Coogue, Aughamore, Ballyhaunis has been released without charge.
A farmer in his 60s was shot dead in the incident shortly before midnight on Tuesday.
A post-mortem examination was completed yesterday evening, but the results aren't being released for operational reasons.
A file will be prepared for the Director of Public Prosecutions.
The victim has been named locally as Brendan Kilduff, of Sallyhernaun, Knock.
Gardai say investigations into the incident are continuing.
An elderly man arrested at the scene was released without charge last night, and a file is to be prepared for the Director of Public Prosecutions.