Seven people have been charged in connection with the death of Private Seán Rooney.
The 23-year-old UN Peacekeeper was killed and three others were injured when their vehicle was attacked in south Lebanon.
Today, Lebanon's military court formally charged them in relation to the attack.
However, only one individual is in custody; Mohammad Ayyad was handed over to the army by Hezbollah last month.
He has been charged with killing Private Rooney and attempting to kill his three comrades with a machine gun.
In addition to an investigation by the Lebanese Army, the United Nations and the Defence Forces are separately undertaking their own inquiries.
Main image: The remains of Private Seán Rooney are carried off the plane at Casement Aerodrome in Dublin, 19-12-2022. Image: Tom Douglas/Newstalk