On March 29, the day Chen Yixiong was found dead, three American criminal and ballistic experts recommended by Li Changyu first arrived in Taiwan to start the investigation. They met with President Chen Shui-bian and inspected the wounds. They believed that the wounds were indeed gunshot wounds. At the same time, he also obtained all the evidence at the time of the incident, went to the scene to investigate, and brought the sampled materials back to the United States to discuss with Li Changyu. On April 9, Li Changyu arrived in Taiwan. On the same day, he secretly visited the presidential palace. After seeing the wounds of Chen Shui-bian and Lu Xiulian with his own eyes, he went to the Bureau of Investigation to obtain all the evidence and photos for research. Then Li Changyu went south to Tainan without stopping, visited Chi Mei Hospital and talked with the doctors who participated in the treatment that day, and reconfirmed that the X-rays and photos previously suspected by the outside world were all right. In the evening, Li Changyu also came to the scene of the crime and used laser technology to reconstruct the trajectory.
It was determined that the murderer might have been hiding near the bus stop to shoot, and because the car was full of fine glass fragments, it was confirmed that the shooting was caused by the outside-in. After repeated experiments and research, according to the on-site reconstruction report submitted by the Criminal Bureau and Li Changyu, the detailed location number list of the hot spot of the shooting was confirmed. Sections 14 to 16 are most likely." RTRH3IG Photo Credit: Reuters / Dazhi Image After confirming the hot spot and trajectory of the killer's shooting, the task force "chased the gun with bullets." It was found that the two stainless steel bullet casings dropped on the scene were similar in appearance, size and internal structure. In addition, there are similar annular marks on the shell, which should be made by the same machine or the same type of machine. In May 2004, the Criminal Bureau investigated and found that the firearms seized in the other two gun cases "He Dunqing Case" and "Yang Zhiqing Case" were from the same source as the bullets involved in the 319 shooting case.
It was found that the bullets in the 319 shooting case were made by the man Tang Shouyi. When the police investigated the flow of bullets made by Tang Shouyi, they learned from relatives and friends of Chen Yixiong, who had drowned, that Chen Yixiong had bought a gun. Family and friends testified that on December 22, 2003, Chen Yixiong purchased bullets made by Tang Shouyi for NT$45,000 through several middlemen on the grounds of "self-defense". After learning about it, they will investigate again whether Chen Yixiong was involved in the 319 shooting case, and at the same time clarify what Chen Yixiong means by buying guns for "self-defense" purposes. It turned out that Chen Yixiong once participated in the recording of the TVBS National Lecture program at Shuipingyuan Park in Tainan City on April 25, 2003. He spoke on the program and criticized Chen Shui-bian's administration for causing the economic recession, and said.