Congress leader Shashi Tharoor's wife Sunanda Pushkar did not commit suicide but was murdered, Delhi Police Chief B.S. Bassi said Tuesday."We have got the final medical report from AIIMS, and we have been told that it was an unnatural death," Bassi told the media. "She died due to poisoning. Whether the poison was given orally or injected into her body is being investigated," he said, adding the report from the All India Institute of Medical Sciences was received Dec 29. A murder case had now been registered, Bassi said.Pushkar was found dead in mysterious circumstances at a luxury hotel here Jan 17, 2014.