A Japanese man in his 80s was found dead with a neck wound at his residence in Thailand on Tuesday morning, local police said Tuesday.
Kazuo Yoshioka was found on the second floor of his two-story house in Wiset Chai Chan district, Ang Thong province, by his 47-year-old Thai girlfriend.
Police found several bloody footprints at the scene and evidence of a struggle.
A bloodstain was also found in front of an adjacent house which belonged to the woman's younger sister.
Investigators are seeking the sister's husband, who has been missing since Monday night. According to a preliminary investigation, the police suspect his involvement in the man's death and want to question him.