Born July 27, 1878. While Commander of the Shanghai Expeditionary Force, troops under Matsui's command committed the Rape of Nanking and other atrocities. Shortly after this invasion of China, Matsui retired and returned to Japan. During the trial, Matsui was represented by Floyd J. Mattice for his American Associate Counsel. Somei Uzawa and Kiyose Ito served as his Japanese Chief Counsel with Takeo Iwamatsu, Takayoshi Jodai, and Ryoichi Omuro acted as his Japanese Associate Counsel. For his involvement with, and probable knowledge of, the atrocities committed in China, the Tribunal convicted of count 55 and sentenced him to death. He was hung at Sugamo Prison on December 23, 1948. Controversially, he was later enshrined, along with 13 other convicted defedants, at the Yasukuni Shrine.
