The curtain has effectively come down on the most mysterious mass-murder case in postwar Japan, with numerous questions left unanswered.
Takehiko Hirasawa, 54, who sought a posthumous retrial for his adoptive father, Sadamichi Hirasawa, was recently found dead in a home in Suginami Ward, Tokyo.
Sadamichi Hirasawa was sentenced to hang for poisoning 12 people to death at a branch of Teikoku Ginko (Imperial Bank) in Tokyo on Jan. 26, 1948, in what became known as the "Teigin Incident." He passed away in a prison hospital on May 10, 1987, at the age of 95, after maintaining his innocence for nearly 40 years.