According to Weng, there were three eyewitnesses to the murder. Furthermore, one was a judge and the other two were prosecutors. All three witnesses stated that the victim had been shot by a single assailant.
翁景惠指出，當時總共有兩個檢察官、一個法官在案發現場，三個目擊證人都指出案發經過是一位兇嫌拔槍殺了張金塗。