Sub-Divisional Magistrate Alok Sharma has asked police to find out the cause of poisoning and also to specifically probe murder or suicide angle.
Union Minister Shashi Tharoor on Sunday recorded his statement before the Sub-Divisional Magistrate who is investigating the death of his wife Sunanda Pushkar under mysterious circumstances in a five-star hotel.
There was no trace of alcohol in the body of Sunanda Pushkar though some evidence of presence of anti-depressant drug was likely, sources in the All India Institute of Medical Sciences said on Sunday.
Rubbishing various speculation surrounding his mother Sunanda Pushkar's death, her son Shiv Menon on Wednesday said she was "too strong" to commit suicide and died due to an unfortunate combination of media stress, tensions and a wrong mix of different medication.
The IAS association has demanded revocation of the order even as the issue of suspension of the lady officer has snowballed into a major controversy.
A woman Indian Administrative Service officer, who had clamped down on illegal mining and resolutely taken head on the powerful sand mafia in Uttar Pradesh, has been suspended barely 10 months after she got her first posting in the state.