Kiyoshi Ōkubo (大久保 清 Ōkubo Kiyoshi January 17 1935 – January 22 1976) was a Japanese serial killer. Between March 31 1971 and May 10 1971 he raped and murdered eight women ages 16 to 21. He used a pen name Tanigawa Ivan (谷川伊凡).
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