A sailor aboard the USS Theodore Roosevelt aircraft carrier in Guam has died from the coronavirus, the Navy said Monday. The identity of the sailor has not yet been provided.

The sailor contracted coronavirus on March 30 and was removed from the ship. He was then transferred to an isolation house on Naval Base Guam, where he received daily medical checks.

“At approximately 8:30 a.m., Apr. 9, the Sailor was found unresponsive during a daily medical check. While Naval Base Guam emergency responders were notified, CPR was administered by fellow Sailors and onsite medical team in the house. The Sailor was transferred to U.S. Naval Hospital Guam where the Sailor was moved to the Intensive Care Unit. The Sailor was declared deceased April 13,” the Navy wrote in a statement.

There are nearly 600 sailors aboard the Roosevelt ship who have been infected with coronavirus. The ship has attracted controversy, after the ship’s former captain Brett Crozier was fired. Crozier had distributed a letter on March 30, urging Navy leadership to protect sailors on the vessel from the virus. The letter was later discovered by the San Francisco Chronicle, resulting in Crozier’s dismissal on April 2 by then Acting Navy Secretary Thomas Modly.

On April 6, Modly flew to Guam, giving a speech on the ship’s PA system disparaging Crozier, calling him “naive” and “stupid.” Modly apologized for his comments and resigned from his position on April 7.

“I also want to apologize directly to Captain Crozier, his family, and the entire crew of the Theodore Roosevelt for any pain my remarks may have caused,” Modly said in a statement.

The coronavirus could affect the readiness of the U.S. armed forces. As of Monday at 11:55 a.m. ET, there are 558,526 cases of coronavirus in the United States, with the domestic death toll of 22,154.