A soldier from 1st Battalion Irish Guards has been killed in Afghanistan, the Ministry of Defence has announced.
He was shot in an ambush while patrolling in the Nahr-e Saraj district of Helmand Province in the afternoon.
The soldier was mentoring an Afghan National Army patrol, the MoD said in a statement. His next of kin has been informed.
It brings the number of UK servicemen and women to have been killed in Afghanistan since 2001 to 345.
Spokesman for Task Force Helmand, Lt Col David Eastman, said: "Regrettably I must report the loss of a soldier from 1st Battalion Irish Guards.
"The soldier was carrying out vital work mentoring an Afghan National Army patrol, in order to develop their ability to protect the people of Nahr-e Saraj (North), when he was struck by small arms fire.
"In carrying out this crucial role he gave his life so that others might hope for a better future. Our thoughts are very much with his family and friends at this deeply sad time."
It comes after Ranger Aaron McCormick of the Royal Irish Regiment, was killed on Remembrance Sunday in a blast as he worked to clear roadside bombs.