On July 18, 1205 (the old calendar), he was blamed for assisting the premeditated murder of his male cousin,Shigetada; and together with his sons, Shigeki Hangaya and Hideshige HANGAYA, he was attacked and killed by Yoshimura MIURA at Kamakura Kyoji-tani, which ended the HANGAYA clan.
元久2年（1205年）6月23日(旧暦)、畠山重忠の乱において、従兄弟の重忠謀殺に荷担したとして咎めを受け、鎌倉経師谷で子の榛谷重季、榛谷秀重と共に三浦義村に討たれて榛谷氏は滅亡する。