Detective Conan: Magician of the Silver Sky (2004)

Juri Maki, famous opera actress, got a mail from Kaido Kido at the balcony with roses. Juri and her assistant found Kogoro and request Kogoro to guard her Destiny Gem during her Josephine final show. Kaido Kido disguised as Kudo Shinichi but left when the show had just played to the middle part. Conan nearly dropped off and Kaido Kido escaped when they both are on the train top. In the SKJ865, Juri suddenly died after eat chocolates. Who was the killer and for what reasons?