Saturday March 6, 2021, 9:00 PM Sergeant Gavin Hillier was injured during a live firing exercise at the Castlemartin range. Credit: Ministry of Defence Sergeant Gavin Hillier, from the 1st Battalion Welsh Guards, was fatally injured at Castlemartin in Pembrokeshire on Thursday. The MoD spokesman, which said it was confirming the death "with great sadness", added: "Our thoughts are with his family and friends at this tragic time. "An investigation is under way and it would be inappropriate to comment further at this stage." In a Facebook post, Sgt Hillier's father Mark said he was "heartbroken" and "absolutely devastated". The incident happened at Castlemartin in Pembrokeshire on Thursday.