A US Army soldier who was in critical condition after suffering non-combat injuries while supporting the military’s pier off the coast of Gaza has died, Reuters quotes the US military as saying.

Sergeant Quandarius Davon Stanley, who recently retired from the military, suffered critical injuries in May while supporting operations at sea of the US-built pier designed to increase flows of humanitarian aid into the Gaza Strip.

In a statement, the US Army confirmed that Stanley had died, though it did not specify when. He was receiving treatment in a long-term care medical center.

Three US troops were injured during the pier operation, which ended in July, but the other two were minor injuries and have returned to duty.