According to a senior doctor at AIIMS, the autopsy report said there was no external or internal injury.
"Also there was no substantial evidence of presence of drugs where his body was found. We are also waiting for the toxicology report which may take a few months' time," he said, adding that they will, however, consult the police before arriving at a conclusion.
Meanwhile, parents of the deceased, Sarvanan Ganeshan, who hailed from Tirupur in Tamil Nadu, have sought intervention of the Centre and the state government for thorough probe into his death.