BJP MP Subramanian Swamy has written to the Union home minister seeking a court-monitored SIT probe into the mysterious death of Sunanda Pushkar, the wife of Congress leader Shashi Tharoor.

Accusing the Delhi Police of “dragging its feet” in the case since last August, when FBI of the US established poison in Pushkar’s body, Swamy in his letter dated May 12 to Rajnath Singh said, the police was not even taking elementary steps necessary in carrying out criminal investigation.

This is his third letter to the union home minister on the issue, with the last one coming in December 2014.  “The FBI of the US was also roped in to determine the nature of poison and despite delay, the bureau was able to pinpoint the name of the poison that was found in her body. But since August 2015, till today, the Delhi Police has been dragging its feet even on elementary steps necessary in criminal investigative procedures such as custodial interrogation of Shashi Tharoor and others,” stated Swamy’s letter.

The newly elected Rajya Sabha MP, who has been accusing the Kerala MP and former UPA minister of his wife’s murder much before becoming a parliamentarian, has suggested to home minister that the SIT should be monitored either by Supreme Court or high court.

“If, however, you feel that an impartial, proper investigation and filing of the chargesheet can still be done by the Delhi Police, I will defer to your wisdom in not approaching the Supreme Court or high court in a PIL to direct a court-monitored SIT probe,” said Swamy in the letter. Sunanda was found dead in a Delhi hotel in January 2014 after having differences with Tharoor over his “relationship” with Pakistani journalist Mehr Tarar. Prior to FBI lab, AIIMS medical board had suggested that a poisonous substance had lead to her death.