The airman was found dead at his off-base residence and an investigation into the incident has been opened.
"I want the American people to understand what has been, what is and what will be, to solve this problem," Okinawa Governor Denny Tamaki said.
A window fell from a CH-53 helicopter in the second such incident in less than a week.
Images of the object suggest it's the shipping cover of an in-flight blade inspection system (IBIS), which is featured on U.S. military helicopters.
The fatal incident has fueled the local governor's campaign to reduce U.S. military presence in Okinawa, Japan.
Troops in Okinawa have been at the center of controversy recently.
The incident will likely add to complications for a controversial plan to relocate a U.S. airbase on the island.