Dear Mr. Brooks,
Thank you for posting your request on History Hub!
The information you seek may be contained in his Individual Deceased Personnel File (IDPF). IDPFs dated after 1976 are in the legal custody of the Army. For the exact location of these files, please write to U.S. Army Human Resources Command, Casualty & Memorial Affairs Operations Division, ATTN: AHRC-PDC, 1600 Spearhead Division Avenue, Department 450, Fort Knox, KY 40122-5405.
The Office of the Armed Forces Medical Examiner issues death certificates for overseas casualties.
We hope this is helpful. Best of luck with your research!