"The patient was brought dead. He looked much thinner compared to what he was before and he had even grown a beard.
He had shot himself inside his mouth and the bullet injury was visible right up to the skull," Dr Gautam Bhansali, Consultant Physician at Bombay Hospital told PTI.
He said that two other doctors, a Casualty Medical Officer and a neurosurgeon, were also present when Roy's body was brought to Bombay Hospital.
When asked if the bullet was stuck inside the skull, Mr Bhansali said it was not visible from the outside but the post mortem would give more details.
"After declaring him dead, we sent the body to Gokuldas Tejpal (GT) hospital for post mortem," he said.
Himanshu Roy, Additional Director General of Police (Establishment), allegedly shot himself with a licensed revolver at his Nariman Point home at 12.40 pm and was rushed to Bombay Hospital where he was declared dead at 1.40 pm, an official said.
Mumbai police, citing his suicide note, said the 1988-batch Indian Police Service officer took the extreme step out of "frustration" due to his prolonged battle with cancer.
"Roy was on medical leave for the last two years as he had cancer and the suicide note, in his own handwriting, makes it clear that he ended his life out of frustration due to this illness," a police statement said.
The high-profile police officer is survived by his mother and wife and would have turned 55 next month.