The announcement would appear to clear up the fate of the notorious Omar al-Shishani, a week after a US official said the most-wanted militant had been targeted in a March 4 attack on the jihadist's convoy.
Islamic State commander 'Omar the Chechen' survived US strike: monitor
"We believe he subsequently died of his injuries," Navy Captain Jeff Davis, a Pentagon spokesman, told AFP.
On Sunday, the Syrian Observatory for Human Rights monitoring group said Shishani had been "clinically dead" for several days.
Islamic State's 'minister of war' likely killed in US air strike: officials
Shishani -- the nom de guerre of Tarkhan Batirashvili -- was one of the IS leaders most wanted by Washington, which put a $5 million bounty on his head.
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