Utsunomiya, Tochigi Pref. - The key suspect in last month’s high-profile robbery-murder case in Tochigi Prefecture has been placed on the international wanted list, sources said Saturday.At the request of Japanese police, the International Criminal Police Organization, or Interpol, has issued a Red Notice for Kazuhiko Masuda, 48, and published his photograph and identifying details on its website.Once his whereabouts are known, the Tochigi prefectural police department and the National Police Agency plan to dispatch investigators and seek assistance from local authorities.