A former Misawa Air Base servicemember who is the former husband of a Misawa woman found dead in a trunk of a burning car in Hachinohe was arrested Saturday on suspicion of fraud, a Misawa police spokesman said.

William Scott Omari McAllister, 24, unemployed with no fixed address, was arrested around 9:58 p.m. on suspicion of using an illegally obtained credit card to buy a car navigation system in February, the spokesman said.

McAllister allegedly used a 57-year-old Japanese woman’s credit card on Feb. 19 to buy the system, priced at about $1,187, at a car supply store in Hachinohe, the spokesman said.

The police were investigating after receiving a report of the credit card’s use from the store owner, but they identified McAllister as a suspect in that case during investigation of the woman’s murder in Hachinohe, the spokesman said. However, the spokesman emphasized, “we are investigating the case as a fraud case.”

McAllister is a former husband of Naomi Kimura, 33, who was found dead in a trunk of a burning car in Hachinohe on July 21, the spokesman said. Kimura owned a bar called Purple Haze that was frequented by non-Japanese.

The case was sent to the prosecutor’s office Monday; McAllister remained in Japanese custody on Tuesday.

Air Force investigators at Misawa Air Base announced in July that because of a request from Japanese police, they are seeking information about Kimura’s death from base residents. No arrests had been made as of Tuesday.