https://www.fieldsofhonor-database.com/index.php/fr/american-war-cemetery-margraten-d/56794-derflinger-james-m
Some men in his unit have been found. He was their medic. He is reported to have died on November 3, 1945 in the Hurtgen Forest, Germany.
That medic went missing on November 3, 1944 and was presumed to have been killed that day.
The Army set the date of death a year later at November 3, 1945.