Saburō Aizawa (相沢 三郎, Aizawa Saburō; September 6, 1889 – July 3, 1936) was a Japanese military officer of the Imperial Japanese Army who assassinated Tetsuzan Nagata in the Aizawa Incident in August 1935. Aizawa was later court-martialed and executed for this murder.
Source: “Saburō Aizawa”, English Wikipedia (CC BY-SA 4.0), excerpt