The five-member medical board constituted to conduct the autopsy, in its preliminary report, has stated that Mr Muthukrishnan died due to hanging.
"The death was due to asphyxia, a condition of severely deficient supply of oxygen to the body due to abnormal breathing, as a result of ante-mortem hanging. No injury mark has been found on any part of the body," said Dr Sudhir Gupta, Head of AIIMS Forensic Department.
"There were signs of dribbling of saliva on the face of the deceased which is a sure sign of ante-mortem hanging. Viscera has been preserved for chemical analysis," Dr Gupta said.
The body of the JNU research scholar was embalmed and handed over to police, he said, adding the autopsy procedure was videographed.
Meanwhile, the police have registered a case of abetment of suicide in the death of Mr Muthukrishnan.
Mr Muthukrishnan, who had named himself 'Krish Rajini' on Facebook, was at the forefront of a students' movement following Rohith Vemula's suicide.
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