Fiosrú says it will begin an independent investigation into the matter on Monday.
The Garda watchdog's to open an investigation into the gun holster used by Detective Garda Colm Horkan.
Detective Horkan was killed when his official firearm was taken from its holster, and he was shot by Stephen Silver in Castlerea in 2020.
His family has been calling for a public inquiry into the matter.
Fiosrú says it will begin an independent investigation into the suitability of Detective Horkan's holster used at the time of his death, after receiving a request from the Justice Minister on Monday.
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