Ikuo Hayashi (林 郁夫 Hayashi Ikuo, born January 23, 1947) is a former AUM Shinrikyo member indicted for participation in the Sarin gas attack on the Tokyo subway. January 23 is the 23rd day of the year in the Gregorian calendar. ... 1947 (MCMXLVII) was a common year starting on Wednesday (the link is to a full 1947 calendar). ... Aum Shinrikyo (also spelled Om Shinri Kyo) was a religious group which mixed Buddhist and Hindu beliefs and was based in Japan. ... A wanted poster in Japan. ...

Prior to joining AUM, Hayashi was a senior medical doctor with "an active 'front-line' track record" at the Japanese Ministry of Science and Technology (now a part of the Ministry of Education, Culture, Sports, Science and Technology, or MEXT in short.) Himself the son of a doctor, Hayashi graduated from Keio University, one of Tokyo's top schools. He was a heart and artery specialist at Keio Hospital, which he left to become head of Circulatory Medicine at the National Sanitorium Hospital in Tokai, Ibaraki (north of Tokyo). Somewhere along the line Hayashi became disillusioned and decided to look beyond conventional medicine. He found AUM during his search [1]. Ministry of Education, Culture, Sports, Science and Technology (文部科学省; monbukagakushō), also known as MEXT is one of ministries of the Japanese government. ... Keio University(library,Mita campus) Keio University (慶應義塾大学 Keiō Gijuku Daigaku) is one of the two most respected private universities in Japan (the other being Waseda University). ... Tokyo ) , literally eastern capital, is one of the 47 prefectures of Japan and includes the highly urbanized central area formerly known as the city of Tokyo which is the heart of the Greater Tokyo Area. ... Tōkai (東海村; -mura) is a village located in Naka District, Ibaraki, Japan. ...

In 1990 he resigned his job and left his family to join AUM in the monastic order sangha, where he became one of Shoko Asahara's favourites and was appointed the group's Minister of Healing, as which he was responsible for administering a variety of "treatments" to AUM members, including sodium pentothal and electric shocks to those whose loyalty was suspect. These treatments resulted in several deaths. Hayashi kidnapped Kiyoshi Kariya, the 68-year old brother of a 62-year old woman who had left AUM. Hayashi and several other men and tortured Kariya in order to find the whereabouts of the woman. Kariya said nothing and died [2]. Shoko Asahara (麻原 彰晃 Asahara Shōkō) (born Chizuo Matsumoto (松本智津夫 Matsumoto Chizuo) on March 2, 1955) is the founder of Japans controversial Buddhist religious group Aum Shinrikyo (now known as Aleph). ...

Ikuo Hayashi and Tomomitsu Niimi were assigned to drop sarin packets on the Chiyoda line as a part of the Tokyo sarin attacks. Niimi was the get-away driver. Hayashi, wearing a surgical mask of the type commonly worn by Japanese people during cold and flu season, boarded the southwestbound 7:48am Chiyoda line train number A725K on the first car, and punctured his bag of sarin at Shin-ochanomizu Station (新御茶ノ水駅) in the central business district before making his escape. Two people were killed and 231 suffered serious injuries. Sarin or GB (O-Isopropyl methylphosphonofluoridate) is an extremely toxic substance. ...

Hayashi was later sentenced to life imprisonment. Life imprisonment is a term used for a particular kind of sentence of imprisonment. ...