A second DNA test with sterile samples reconfirms the rough DNA match leading Conan to a conclusion. Conan tranquilizes Kogoro and reveals Banba and Kamon are opposite sex identical twins. The secret phone calls were to a medical consultant with the final phone call confirming the genetic match. Learning of his, Kamon clasped her face into her hands, scratching some skin off, and committed suicide. In the aftermath, Amuro pays Kogoro to have him as his apprentice (thetvdb.com)