On April 1, 1351, when he was taken to Kyoto by Tadayoshi, Moroyasu and his family, including Moronao and KO no Moroyo, a son of Moroyasu, were killed at Mukogawa, Settsu Province by Yoshinori UESUGI, a member of Tadayoshi group.
そして同年2月26日、直義の手で京都へ護送される途中、直義派の上杉能憲により、同国武庫川で師直や息子の高師世ら一族と共に殺された。