Japanese authorities accuse the 20-year-old serviceman of killing a 39-year-old woman and taking her belongings from a Naha hotel.
TOKYO — Japanese police arrested a 20-year-old U.S. Marine on suspicion of killing and robbing a 39-year-old woman at a hotel in Naha, Okinawa, prompting a formal protest from Japan’s government and renewed scrutiny of crimes involving American military personnel on the island.
Lance Cpl. Devin Jacob Ballard, assigned to the III Marine Expeditionary Force and based at Marine Corps Air Station Futenma, is suspected of killing Anna Yagi early Saturday and taking her wallet and backpack, according to police accounts reported by Reuters and Stars and Stripes. Police said Ballard denied the allegations. He remained in Japanese custody Sunday as authorities continued their investigation.
Police allege the killing occurred between about 2:10 a.m. and 4:17 a.m. at the Naminoue Crystal Hotel in Naha’s Wakasa district. Security camera footage showed Yagi entering the hotel with a man believed to be Ballard and the man later leaving alone, according to police accounts. A hotel employee later found Yagi unresponsive after the room’s occupants failed to check out.
Authorities have publicly described the case as both a suspected killing and robbery. Japanese news reports citing investigators said Yagi appeared to have been strangled, but police have not released a final autopsy finding establishing the precise cause of death. The allegations against Ballard have not been proven in court.
Police located Ballard later Saturday night in an entertainment district in Okinawa City, according to authorities cited by Stars and Stripes. Officers questioned him and arrested him early Sunday. Police said the case was expected to be referred to the Naha Public Prosecutors Office under Japan’s criminal procedure system.
The arrest quickly became a diplomatic issue. Prime Minister Sanae Takaichi said Japan had lodged a strong protest with the United States and called for maximum cooperation with the investigation, stricter discipline among U.S. military personnel and steps to prevent similar incidents. Foreign Minister Toshimitsu Motegi also summoned U.S. Ambassador George Glass to express the government’s concern.
Okinawa Gov. Genta Koja said the case had caused fear and anger among residents already living near a large U.S. military presence. Okinawa hosts a significant share of American forces stationed in Japan, and criminal cases involving U.S. personnel have repeatedly strained relations between local communities, Tokyo and Washington.
The U.S. Embassy in Tokyo said it was communicating and cooperating with Japanese authorities and extended condolences to Yagi’s family. The Marine Corps also said it was cooperating with the investigation and takes allegations of serious criminal conduct by Marines seriously. No separate U.S. military charge against Ballard had been publicly announced as of Sunday.
The case comes amid decades of debate over the concentration of U.S. military facilities on Okinawa. Residents have raised concerns about noise, aircraft accidents and criminal conduct involving service members, while Tokyo and Washington maintain that the island is strategically important to their security alliance. A 1995 rape case involving three U.S. servicemen triggered large protests and remains a major reference point in local opposition to the military presence.
Japanese authorities had not announced a court date or final charging decision as of Sunday. Ballard remained a suspect in custody, and investigators were continuing to examine surveillance footage, the victim’s belongings and other evidence as prosecutors prepared to review the case.
Author note: Last updated October 4, 2026.