 When the police arrested Mami the following day, she confessed to the killing of the other three victims.The police found the car containing the bodies of the three victims in the Suwa River in Omuta.The other participants in the murders included Mami's husband Jitsuo Kitamura, the leader of Kitamura-gumi; Takashi Kitamura, her son from a previous marriage; and Takahiro Kitamura, her second son.