Delhi Police Commissioner B S Bassi said Tarar may be questioned, if required, as she may throw light in the case.
"If required, we will speak to her as she is a relevant person who can throw light in the case. Our efforts will be to talk to her," Bassi said when asked whether the SIT probing the case will examine her.
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Tarar had two months back said that she was ready to answer any question on the issue.
"If they want to ask me anything...If they want to ask me any question whatsoever that they think...I can answer," 46-year-old Tarar had said a day after Delhi Police had registered a murder case into Sunanda's death.
52-year-old Sunanda was found dead in her suite at a five star hotel in south Delhi on the night of January 17 last year, a day after she was involved in a spat with Tarar on microblogging website Twitter over the latter's alleged affair with Tharoor.
Tharoor was questioned by the investigators last month.
Bassi said investigators have also asked the Federal Bureau of Investigation (FBI) in the US to complete examination of Sunanda's viscera as soon as possible.
A senior police official had gone to the US to give the sample of Sunanda's viscera to the FBI.
The investigators want to confirm the kind of poison which was found in Sunanda's body by a panel of doctors of AIIMS. The AIIMS report could not find out the kind of poison in her body.
"We had told them (FBI) to do it as early as possible. They follow certain procedures and processes. So it may take some time," Bassi said.
He said, if required, Tharoor will "definitely" be called for questioning again.
He said the certain gadgets obtained by the investigators are also being examined.
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