Aoni Production announced on Friday February 22nd, 2013 that
Chieko Honda (本多知恵子) died due to
Multiple myeloma cancer and had been undergoing medical treatment in hospital at the time. She died on February 18th, 2013. She was best known to Pocket Monsters fans as the voice actor for
Natane (ナタネ).
Source:
http://www.aoni.co.jp/