In 1566, while holding a council with his senior retainers at Kōzenji Temple, Iechika was shot to death by Endō Matajirō and Yoshijirō, two brothers who had received orders from Ukita Naoie.
During a council at Kōzenji Temple in 1566, Iechika was murdered by Endō Matajirō and Yoshijirō, the sons of Ukita Naoie, who were given orders to carry out the deed.