Consequently, SANO killed himself by disembowelment, together with the others, inside of the residence of the Aizu Domain in Kyoto City (It is also said that they were barbarously murdered by Kuwajiro OISHI and other members of the Shinsengumi).
茨木司・富川十郎・中村五郎らと共に、会津藩邸内にて切腹した（異説では、新選組隊士大石鍬次郎らに惨殺されたとも）。