US Air Force Major-General Gregory Stone, 40, died from the wounds at an Army field hospital in Kuwait, the Kuwait news Agency KUNA reported.
Stone was wounded in an attack on the Camp Pennsylvania, Northern Kuwait, when fellow soldier Asan Akbar, who adopted Islam last year, lobbed three grenades into the tent and opened fire on it.
A 27-year-old Captain, Christopher Scott Seifert, was killed and 15 other soldiers were wounded.
On Tuesday Army Sgt. Akbar was taken to Germany and placed in a military jail.
Medicinal properties of Nigella sativa (nutmeg flower) herb, which is commonly used in culinary as a seasoning, against COVID-19 have not been fully proven