"I want to clarify that not only Sunanda Pushkar, but all the post-mortem reports prepared by me are based on the principles and ethics of medicine," Sudhir Gupta, head of forensics department at All India Institute of Medical Sciences (AIIMS), told reporters outside his residence here.
Pushkar, 52, was found dead in a mysterious condition in her room at a five-star hotel in south Delhi Jan 17.
"So not only this case, but in every case I have prepared all the reports on the basis of the ethics and law," he added.
Earlier, Gupta said he was pressurised by top officials to show that Congress MP Shashi Tharoor's wife Sunanda Pushkar's death was "natural".
Delhi Police set up a Special Investigation Team a few days after Pushkar's death to probe the case as it occurred a little over three years of the marriage. Under the law, every death of a bride within three years of marriage is viewed with suspicion that it may be a case of dowry death.