Opposition parties in Kerala Saturday demanded an independent and comprehensive probe into the death of Thiruvananthapuram MP Sashi Tharoor's wife Sunanda Pushkar.

The deamand came after Pushkar's latest post-mortem report, leaked Thursday, stated "poisoning" to be the cause of her death. Pushkar, 52, was found dead in mysterious circumstances in her room at a five-star hotel in Delhi Jan 17. 

C. Divakaran, Communist Party of India legislative party leader, said the only way the truth can come out was not an CBI probe but only a team appointed and supervised by the Supreme Court will be able to come out with what had happened.

"Just because Tharoor won the Lok Sabha polls does not absolve him. After all he is the husband and he should take the lead in finding out what really happened to his wife, so are people here," said Divakaran.

Echoing Divakaran, Communist Party of India-Marxist state secretary Pinarayi Vijayan said a comprehensive probe was needed to find the truth. 

"There is a mystery in this case and the people would like to know the truth and for that it can be done only if there is a comprehensive probe," he said.