Delhi Police Commissioner B S Basi has confirmed that Sunanda Pushkar, the 39-year-old NRI wife of Congress MP Sashi Tharoor was poisoned either orally or by injection, leading to her demise that the AIIMS medical board called an unnatural death. A case of murder has now been registered. Pushkar was found dead in a five-star hotel room in Delhi in 2013. The suite has remained sealed since. Last year a medical board constituted by the All India Institute of Medical Sciences (AIIMS) to examine Pushkar's death, criticised the Delhi police for not furnishing essential evidence and documents needed for experts to form an opinion. The Board concluded that Pushkar's vital organs, kidneys, lungs and liver were functioning normally and her death was caused by poisoning. The forensic team also found a mark on the victim's body that was caused by the needle of a syringe, besides some 15 other injury marks. An FIR has been filed and a special team has been formed to investigate the case that will be overseen by deputy commissioner of police Prem Nath. Delhi police are also seeking the list of passengers who travelled from Dubai and Pakistan to Delhi and vice versa on the day the victim was found dead. A day before Pushkar was found dead she and her husband issued a joint statement rubbishing unauthorised tweets and said they were 'happily married and intend to remain that way'. Reacting to the latest police statement, Pushkar's cousin Ashok Kumar said they always knew this was a case of murder.