In 2005 at Hiratsuka, Kanagawa Prefecture, Japan, Rikako Okamoto (岡本 利加香, Okamoto Rikako, 1986 – c. October 12, 2005) was murdered and her mother Chizuko Okamoto (岡本 千鶴子, Okamoto Chizuko) (born July 17, 1951) was later convicted of killing her own daughter. Chizuko Okamoto was also suspected as a serial killer who might have killed at least four others, but was not charged. Asahi Shimbun described her mysterious incident as "house of horrors".[1]