[Lestrade wrinkles his nose at the smell, but he gets his notebook out all the same to read from.]

Danny Matthews suffered a gun shot wound to the abdomen, he was treated in the field by Captain Watson and then shipped back to England in a coma. When he woke up, they discovered that he'd suffered brain injuries, likely because of a lack of oxygen or blood loss during the time taken to get to him on the battlefield. He killed himself seven months later.