Mr Tharoor used Facebook to make a statement about the case today.
Former union minister Shashi Tharoor said today that his family "never thought of any foul play" in the death of his wife, Sunanda Pushkar, whose body was found in a five-star hotel in Delhi a year ago. (Sunanda Pushkar, Wife of Shashi Tharoor, Was Killed: Police
The Delhi Police Chief BS Bassi said today that Ms Pushkar, 51, was murdered.
"Poison consumed by the victim was the cause of death. Poison was either given orally or injected into the body," Mr Bassi told NDTV.
The murder case registered today in Delhi does not name any suspect, but Mr Bassi said he has ruled out suicide, which had been suspected earlier. When asked if Mr Tharoor, a Parliamentarian from Kerala, will be questioned, the police chief replied, "We will interrogate and investigate whosoever is required."
Mr Tharoor used Facebook to make a statement. "I am stunned to hear that the Delhi Police have filed a case of murder against unknown persons in the demise of my late wife Sunanda. Needless to say I am anxious to see this case is investigated thoroughly and continue to assure the Police of my full cooperation," he wrote. (Read Entire Statement Here
"Although we never thought of any foul play in the death of my wife, we all want that a comprehensive investigation be conducted and that the unvarnished truth should come out,"
he said, stressing that he has not been provided with copies of medical and postmortem reports.
Ms Pushkar, married to Mr Tharoor since 2010, had been taking medication for various illnesses in the days before she died and early autopsy results suggested she may have overdosed on anti-depressants and sleeping pills.
But the police chief said that a medical report submitted by doctors at Delhi's famous AIIMs hospital confirms that "her death was unnatural."