During the course of the day, Kilmer led a scouting party to find the position of a German machine gun. When his comrades found him, some time later, they thought at first that he was peering over the edge of a little hill, where he had crawled for a better view. When he did not answer their call, they ran to him and found him dead. According to Father Francis P. Duffy: “A bullet had pierced his brain. His body was carried in and buried by the side of Ames. God rest his dear and gallant soul.” A sniper's bullet likely killed him immediately. According to military records, Kilmer died on the battlefield near Muercy Farm, beside the Ourcq River near the village of Seringes-et-Nesles, in France, on July 30, 1918, at the age of 31. For his valor, Kilmer was posthumously awarded the Croix de Guerre (War Cross) by the French Republic.