During the third hour, an autopsy was performed. This was because of the growing media interest. The autopsy revealed that the bullet entered Selena's lower back. It passed through Selena's chest cavity, which instantly damaged Selena's right subclavian artery. The bullet then exited the right upper chest. The autopsy also revealed that Selena's heart, fueled by adrenaline, pumped her blood out. The doctor said that if the bullet had hit Selena a millimeter higher or lower, the wound would not have been as severe.