The mortal remains of Sunanda Pushkar, wife of Union minister Shashi Tharoor, were consigned to flames in New Delhi on Saturday evening.
The cremation took place around 5.30pm at the Lodhi crematorium in south Delhi, near the couple's residence in Lodhi Estate.
Earlier, doctors who performed post-mortem Sunanda’s body found certain injury marks, which "may or may not be related to her death".
"There were certain injury marks on her body. The nature of the injuries cannot be revealed. It is a case of sudden unnatural death," said a doctor at All India Institute of Medical Sciences (AIIMS), where the autopsy was done.
"We have conducted the post-mortem examination. We have completed the whole procedure," said Sudhir Kumar Gupta, head of the department of forensic medicine at the AIIMS.
Read: Sunanda found dead days after accusing Shashi Tharoor of being 'unfaithful'
Read: Burden of losses affected Sunanda emotionally, say psychologists
"Samples for toxicological analysis, which means ruling out any poison and pathology of the heart, has been preserved by us and it will be tested and analysed by us in the laboratory," he said.
A drug overdose could be the reason for the death, news agency IANS reported quoting police sources.
"It could be a case of drug overdose but things would be clear only after the detailed autopsy report," the sources said, adding it could be an overdose of sleeping pills.
Earlier in the day, Tharoor, who was admitted to AIIMS, was discharged after doctors said he was fine. He had complained of uneasiness and chest pain.
Read: Sunanda did not have serious health problems, say doctors
Read: Sunanda Pushkar's Twitter trail reveals hurt, sense of betrayal
Tharoor was initially admitted to the ICU and was later shifted to a private ward when his condition stabilised. Doctors treating him said he was suffering from hypertension and palpitations and was feeling giddy.
A spokesman of the hospital said, "Everything is normal. The chest pain is normal now and his condition is stable."
The police are probing accidental overdose of blood pressure pills as a possible reason behind Sunanda, sources said on Saturday.
Sunanda, the 52-year-old wife of the Union minister, was found dead around 8.15pm on Friday at a seven-star hotel in Delhi where the couple had checked in a day earlier.
Her body was found in the bedroom of suite number 345 at The Leela Palace two days after her Twitter spat with Mehr Tarar, a Pakistani journalist, over an alleged affair with the minister.
Read: Mehr Tarar 'absolutely shocked' at Pushkar's death
Read: Who's Mehr Tarar?
"We will seek information from Twitter about any direct messages exchanged between Sunanda and others," said a police officer investigating the case.
Police sources also said that there was a minor altercation between Sunanda and the minister before they moved into the hotel.
They said that no suicide note was found and it could be possible that Sunanda died of tuberculosis, which was diagnosed recently.
News agency ANI reported the case was being probed under Section 176 of the Criminal Procedure Code as the marriage was less than seven years old.
Sources also added that she died at least four hours before her body was recovered in the suite bedroom and said rigor mortis suggested that Sunanda died of a possible heart attack.
Read: Pakistani journalist takes on Sunanda
Pushkar and Tharoor were at the centre of a raging controversy after reports emerged that she was upset over reported text and tweet messages between her husband and Tarar.
A joint statement from the couple on Thursday said that they were "happily married" but distressed by "some unauthorised tweets".
With PTI, ANI, IANS inputs
Read: Trio's tangle: Shashi Tharoor's personal life becomes Twitter gossip
Here are the people's reactions to the incident on Twitter: