A second man in his 20s was injured in the incident at a house in Ballinasloe, early on Monday.
A man arrested as part of the investigation into a Midlands shooting has been released without charge.
Another man in his 20s suffered non-life threatening injuries during the incident at a house in Dunlo in Ballinasloe in the early hours of Monday morning.
He was treated at University Hospital Galway.
Gardaí had been detaining a man in his 20s at a Garda station in the northwest - he's now been released without charge, with a file being prepared for the DPP.
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