According to Mainichi News, a 46 year old woman, who had been arrested for threatening an elementary school, confessed that she had also sent a kitchen knife to seiyu Hayami Show's house. Police will re-arrest her for that crime. The woman is an anime fan and one of the members of Hayami's fan club. Hayami has been receiving threatening letters to cancel his show for these four years and Tokyo metropolican police is investigating her involvement in the case.

Source: Mainichi