Tetsuya Shiroo

Tetsuya Shiroo (城尾 哲彌, Shiroo Tetsuya, born 1948) is the former leader of the Suishin-kai, a Nagasaki-based yakuza group affiliated with the Yamaguchi-gumi, the largest yakuza organization in Japan.

On April 17, 2007, Shiroo shot Iccho Itoh, the mayor of Nagasaki, who died early the next morning.

Shiroo's apparent motive for the assassination was a grudge over an insurance claim. City officials had refused to compensate him for a Yamaguchi-gumi vehicle that was damaged at a public works construction site in 2003. It was reported in the Japanese press that prior to the shooting, Shiroo had mailed a letter to TV Asahi outlining his grudges against the mayor and the city government. In addition to the insurance claim, Shiroo was also reportedly angry that a construction company linked to his gang had been denied a contract by the city government. He later told police that he had been planning the assassination since February.

Japanese police stated that the killing was a result of this personal grudge, and was not authorized by the Yamaguchi-gumi leadership. After the mayor's death, Shiroo's gang, the Suishin-kai, announced that it would voluntarily disband.