The Central Bureau of Investigation on Thursday questioned Kolkata-based industrialist Ashok Todi, the main accused in the case relating to death of computer graphics teacher Rizwanur Rahman who had married his daughter Priyanka.
Todi, who was summoned to the CBI headquarters in New Delhi, was quizzed by the CBI for nearly two hours during which he was confronted with conversations he had with Rizwanur Rehman.
The noted industrialist will undergo a lie-detector test on Friday at the Centre for Forensic Sciences Laboratory.
Besides Todi, his brother Pradeep and two others, including Papu, who allegedly took money to break up the marriage between Rehman and Priyanka, will be questioned before the agency wraps up its investigations into the case.
Sources said it was turning out to be a case of suicide but the victim had been forced to take the extreme step allegedly at the behest of the close kin of Priyanka's family.
The probe into the death of Rehman was reaching its final stage, sources claimed. There have been clear indications that the relatives of the girl had allegedly used pressure tactics to drive Rehman to such a stage where he took the extreme step of committing suicide, they said.
Last month, the CBI had registered a case against the industrialist father-in-law of Rehman, Ashok Todi, and others under section 302 (murder) of IPC.
The Kolkata police officers, who allegedly pressurised Rehman and Priyanka to separate, were also quizzed by CBI.
The CBI sources said the agency would recommend Regular Departmental Action (RDA) at least against two Kolkata policemen for alleged intimidation.