 It was during this action that an Improvised Explosive Device was detonated, which killed Corporal Mulvihill instantly.Lieutenant John Thornton, aged 22, and Marine David Marsh, aged 23, both of 40 Commando Royal Marines.Just after 1653 hours local time on Sunday 30 March 2008, the Marines were conducting a patrol in the vicinity of Kajaki, Helmand province, when the vehicle they were travelling in was caught in an explosion.