It was learnt that CBI grilled him over the reasons that prompted him to change his opinion on Saradha.
Nalini said in a statement in Chennai that she was not questioned by CBI, but “consulted” professionally.
According an earlier report in The Indian Express on Sen’s letter , Nalini had denied any involvement in the deal.
In the last three months, the CBI has conducted raids on 64 locations in Bengal, 15 in Assam and 89 in Orissa.
CBI examined Nalini, a Supreme Court lawyer, in connection with the legal fee paid to her by the Saradha group.
Rabin Deb said he had received the summons, but asked the CBI for some time before he presents himself before the investigators.
Barua committed suicide by shooting himself in his residence at Uzanbazar on Wednesday afternoon.
The source in the CBI also alleged lack of cooperation from the state police and authorities.
He was an upright and efficient police officer who discharged his duties conscientiously and assiduously, said Gogoi.
The ex-DGP was among five persons whose houses were searched by the CBI in connection with the Saradha scam on August 28.
Media reports say Ajit Banerjee is one of the beneficiaries of the ill-gotten money of the now-bust group.
The Saradha scam had come to light in April 2013 after the group downed shutters without repaying lakhs of investors.
Sources said a Rs 20-crore deal between Bose’s media house and the Saradha group was under probe.
CBI sources said both Srinjoy Bose and Sameer are likely to be interrogated by the agency again on Thursday.
Sources said Majumdar was paid Rs 10 lakh per month by Saradha Group and he could not explain why he was paid such a high sum.