Was Mehr Tarar the reason of a rift between Sunanda and Shashi Tharoor?

Earlier, Dr Sudhir Gupta, the head of forensics department at All India Institute of Medical Sciences (AIIMS), has alleged that he was pressurised to show that Congress MP Shashi Tharoor's wife Sunanda Pushkar's death was "natural". The AIIMS administration has denied Dr Gupta's allegation.