A sailor assigned to the USS Theodore Roosevelt died Monday from the coronavirus, the Navy said, the first death of a crew member serving on the aircraft carrier currently docked in Guam.

The Navy released few details about the sailor, who tested positive for the virus on March 30 and had been placed into isolation on Guam with four other sailors. The sailor was found unresponsive Thursday morning, after being moved into an intensive care unit.

Military officials last week revealed another sailor had also been hospitalized. At least 585 sailors on board have tested positive for the virus, which causes a disease known as COVID-19.

Senior Pentagon officials initially downplayed the effect of the virus on the ship's crew when it first sailed to Guam at the end of March for previously scheduled maintenance, saying that none had been hospitalized.

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The spread of the virus on board the ship has since effectively sidelined the crew of one of the military's most powerful instruments of international deterrence.

Then acting-Navy Secretary Thomas Modly relieved the ship's commander , Capt. Brett Crozier, earlier this month after he sent an email that later became public begging for more assistance in mitigating the spread of the virus. Modly later resigned following widespread backlash to his decision and his attempts to defend it .

Roughly 90 percent of the crew of 4,800 had been tested for the virus, the Navy said on Monday, as the ship's commanders disembark a majority of the crew for treatment and isolation on the island. Navy leaders continue to say that the carrier remains ready to deploy if necessary, with a skeleton crew on board to maintain essential tasks such as maintaining the ship's nuclear reactors.

At least four of the military's 11 aircraft carriers have reported instances of the coronavirus among its crew. The USS Nimitz, currently preparing to deploy from its home port in Washington, instituted new measures to contain and treat the virus following news of the Roosevelt and two reported cases of the virus among its own crew. Those sailors have completed quarantine measures, having shown no further symptoms, and as of Friday were returning to the Nimitz.