Sources said that Tharoor, who is in Kerala, has been asked to join probe at the earliest.

"A legal notice has been issued to Tharoor to join the murder probe. The questioning will be held under section 160 CrPC," said a senior an official.

Delhi Police had registered a case of murder a few days ago, following the final report from the board of doctors which conducted post-mortem on Pushkar.

An SIT has also been formed by the police to probe the case.

Pushkar was found dead in a south Delhi hotel's suite on January 17 last year.

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