A 35-year-old woman is found dead in her apartment with a silk scarf tightly wound around her neck. The ligature mark is horizontal, complete, and encircles the entire neck. There is no ligature mark above or below this line. The face is pale, not congested. The eyes are partially open with a vacant stare. No petechial hemorrhages are visible on the eyelids or conjunctivae. The mouth is slightly open. What is the most likely type of asphyxial death, and what is the distinguishing feature?