There's been a call for a public inquiry into the circumstances surrounding the murder of Garda Tony Golden and the serious wounding of Siobhan Philips in 2015.
Ballina native Garda Golden was shot dead as he accompanied Siobhan to the home she shared with her partner Crevan Mackin.
It's believed Mackin then turned the gun on himself.
GSOC is now investigating claims the Gardaí had information about Mackin and the weapons and bombs he had in his possession in the months prior to his death.
Siobhan's family now wants a full public inquiry.