Masumi Hayashi (林 眞須美, Hayashi Masumi, born July 22, 1961) is a Japanese murderer convicted of putting poison in a pot of curry being served at a 1998 summer festival in the Sonobe district of Wakayama, Wakayama, Japan. Crime[edit] A communal pot of curry being served to residents of Sonobe district, Wakayama, was poisoned with at least 130 grams of arsenic – enough to kill over 100 people – on Ju