Investigators are "examining" the report by the Sub- Divisional Magistrate to chalk out future course of action in the case following the autopsy report mentioning "poisoning" as the cause of the "sudden and unnatural" death of 52-year- old Sunanda, sources said.
They said police may issue notices under 160 of CrPC (which entails witnesses to join probe) to Tharoor and 11 others including Sunanda's brothers and son asking them to join investigations.
Meanwhile, Shiv Menon, Sunanda's 21-year-old son from a previous marriage, said his mother was "too strong" to commit suicide and she died due to an "unfortunate combination of media stress, tensions and a wrong mix of different medication".
However, he ruled out that there was any foul play, saying both Tharoor and his mother were "very much in love" despite their "occasional differences" and that he did not believe the Union minister was capable of harming her physically.
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"I also do not believe that Shashi was capable of physically harming her, let alone the speculation that he could have taken her life," he said.
Sunanda was found dead in a 5-star hotel in South Delhi on Friday night, a day after her Twitter spat with Pakistani journalist Mehr Tarar over an alleged affair with Tharoor.
"It was an unfortunate combination of media stress, tensions and a wrong mix of different medication. Her death was peaceful, she passed in her sleep. Please let her soul rest, I think there has been enough attention drawn towards her life," Menon said.
The autopsy report also mentions a "deep teeth bite" on the edge of the left palm apart from mentioning over a dozen injury marks.