Naganori died by Seppuku with Kaishaku (to assist someone in committing hara-kiri by beheading him) by Takedayu ISODA (bakufu Kachi-metsuke title [job to do night duty and inspection]) in the presence of bakufu Kenshi (inspector) such as Shoda, Okado and Okubo.
長矩は庄田・多門・大久保ら幕府検使役の立会いのもと、磯田武大夫（幕府徒目付）の介錯で切腹して果てた。