A 57-year-old man was found unconscious while running in Ma On Shan Park at 10pm. His head was bleeding after fell down. A citizen called the police and he was sent to hospital after ambulance has arrived. After initial resuscitation, he was certified dead after arrived at the hospital. He had no record of suffering from cardiac disease before but the police was believed that he had recessive disease or dead from bruising his head. The cause of dead would be determined after autopsy.