The Director of Public Prosecutions won't be prosecuting a member of the Gardaí who shot and killed George Nkencho outside his family home in December 2020.
The Garda Síochána Ombudsman Commission (GSOC) confirmed the criminal investigation it carried out ended in June last year.
It forwarded an investigative file to the Office of the Director of Public Prosecutions (DPP) following the completion of "an independent criminal investigation" into the death of Mr Nkencho.
Mr Nkencho was shot dead in the front garden of his family home in Clonee after an alleged assault with a kitchen knife in a shop.
Bullets were fired from an official Garda firearm after several threats were made and an attempt to resolve the situation with non-lethal force failed.
GSOC says it has noted the DPP’s decision and has notified interested parties in the case, including the Nkencho family and Garda members involved.
"While GSOC can make no further comment at this time, it will continue to engage with the Nkencho family in the context of coronial proceedings and any other statutory processes that may arise," the body said in a statement.
"GSOC further reiterates its undertaking to make the substantive detail of its investigation publicly available as and when other statutory processes permit it to do so," it added.
Mr Nkencho's death was followed by a number of protests in west Dublin.