At first the police did not rule out rape, a crime of passion or a robbery. But after investigating Hsu Chia-chen's contacts before her death, they announced on the morning of 12 March that the case had been solved, and that the killer was Hsu's classmate and close friend Hung Hsiao-hui.
起初警方不排除姦殺、情殺和財殺的可能，後經警方清查許嘉真生前的交往情形，隨即於十二日凌晨宣佈偵破，兇手竟是死者的同班好友洪曉慧。