Indrani Mukerjea is currently in judicial custody in connection with the Sheena Bora murder case.
The Central Bureau of Investigation (CBI) today approached a magistrate's court here seeking permission to conduct voice sampling test of Indrani Mukerjea, the prime accused in the case relating to the murder of her daughter Sheena Bora.
"We have moved the court seeking permission to conduct voice sampling on Mukerjea. The court issued a production warrant and she is likely to be produced in the court tomorrow," said a CBI official.
The voice sampling was required as CBI had got hold of some call recordings which featured her, he said.
Meanwhile, Ms Mukerjea's former driver and co-accused, Shyamvar Rai was produced in the court today following his October 19 letter where he had said he wanted to reveal some "truths" to the court regarding the Sheena Bora murder case.
"Magistrate RV Adone had a brief conversation with him today. He will be produced again tomorrow," said a CBI source.
Ms Mukerjea, her former husband Sanjeev Khanna and Rai are currently in judicial custody in connection with the case.
They are accused of murdering Sheena and dumping her body in a forest in neighbouring Raigad district in April 2012. Last month, Maharashtra government decided to transfer the probe to CBI.
On October 2, Indrani was taken to JJ Hospital from Byculla womens' prison in an unconscious state, fueling speculation that she had overdosed on anti-depressant drugs.
But the probe by Inspector General (prisons) ruled out the possibility of drug overdose, poisoning or suicide bid.
On October 6, the 43-year-old was discharged and sent back to jail. CBI was permitted to question her in the jail.