The police chief, however, did not disclose the time when the former union minister would be questioned. Tharoor was earlier questioned Jan 19 at the Vasant Vihar police station in south Delhi. Police had constituted a special investigative team (SIT) to probe the murder after registering a FIR in the case Jan 1 this year. Sunanda Pushkar was found dead in a luxury hotel room Jan 17, 2014. A case of murder was registered against unknown people Jan 1, 2015. (IANS)