The suspect Chen Shifeng transferred his anger onto an innocent person due to his private feelings. He disguised himself and premeditated and planned to hide himself at the entrance of Jiang Ge’s house in the early morning. He unscrupulously killed Jiang Ge since Liu Xin closed the door, and stabbed Jiang Ge, an unarmed and delicate girl, for 10 times with a knife, which was really brutal and flagrant.