Disclosing this, Delhi Police Commissioner B S Bassi did not rule out questioning Tharoor, now a Congress MP and a former Union Minister.
It was not clear whether she had consumed the poison on her own or it was administerd forcefully or by injection, he said.
Nearly a year after 51-year-old Sunanda was found dead in a luxury hotel here on January 17, Delhi Police filed the case of murder under section 302 of the IPC but no one has been named in the FIR.
Sunanda's death had created a sensation as it came hot on the heels of a bitter spat between the couple over the twitter over his alleged affair with Pakistani journalist Mehr Tarar.
"On 29th December, the medical board of AIIMS has given us a report. The main thing they have informed us is that the death is unnatural and not natural. Secondly, it is due to poison that could have been taken orally given or injected and they have told us other things as well," Bassi said.
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