A 23-year-old woman has been arrested as part of the investigation into the murder of a man in West Dublin in 2017.
Father-of-two John Gibson died after being shot a number of times at Fortunestown Lane in Tallaght on September 18 that year.
A 22-year-old man who was arrested on Monday in connection with the shooting has been released without charge.
A file will now be prepared for the information of the Director of Public Prosecutions.
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Investigations are continuing.