A man is found dead, hanging from a low hook on a bathroom wall in a prison cell. The official cause of death is listed as suicide by hanging. A forensic pathologist reviewing the autopsy photographs finds extensive petechial hemorrhaging -- tiny burst blood vessels -- across the face, neck, and upper chest. In cases of hanging, petechial hemorrhaging typically appears above the ligature point (the line of the noose) due to blood being trapped in the head. In this case, the hemorrhaging extends well below any possible ligature line, covering the upper chest. What method of killing, other than hanging, produces this specific distribution pattern, and what does the chest involvement indicate?