New Delhi, Feb 12 (ANI): Congress leader and former Union Minister Shashi Tharoor is presently being questioned for the second time in connection with his wife, Sunanda Pushkar's murder. The interrogation round is underway at the SIT office in south Delhi's Vasant Vihar area. Tharoor's domestic help, Narain Singh, is also likely to be questioned by the SIT today. Last week, Sunanda Pushkar's son, Shiv Menon, was also interrogated by the Special Investigation Team (SIT). Last month, Tharoor was interrogated at the Vasant Vihar police station in South Delhi. The police had earlier in January said that based on available evidence, Sunanda Pushkar, 51, was poisoned. A case of murder was registered on January 6. Sunanda Pushkar was found dead in the five-star Leela Hotel in Delhi on January 17, 2014.