• Autopsy - Special face and neck dissection is must.

External - specific features

              Fabric around the mouth (to mute the victim)

Internally - soaked fabric  is found in the air passage (oropharynx )

Circumstantial - injuries of sexual violence, struggle or assault

• Toxicology to be done to identify intoxication

• Scene investigation help to identify the circumstance, Time since death, etc.