"As per the provisions of Code of Criminal Procedure (CrPC), we have to file the charge sheet in the case within 90 days of the arrest of the accused, otherwise the accused are eligible for a default bail," said a CBI official.
Apart from 43-year-old Indrani,the accused include her former husband Sanjeev Khanna and her former driver Shyamvar Rai.
Indrani and Rai were arrested on August 25 and Khanna the next day. The charge sheet will be filed in a court of metropolitan magistrate in South Mumbai.
The case is being investigated by the Special Crime Branch of the CBI.
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Indrani, along with Khanna and Rai, has been accused of murdering Sheena (24), her daughter from previous relationship, and disposing of her body at a Raigad forest in April 2012, about 84 kms from Mumbai.
The Maharashtra government had transferred the case to CBI in September, saying it as an attempt to clear all doubts over the probe and the officers involved as the then Mumbai police commissioner Rakesh Maria had personally led the probe.
During their investigation, police suspected that Indrani had been upset with Sheena's relationship with Rahul, son of her husband and former Star India CEO Peter Mukerjea, who was also quizzed.
Indrani, lodged in Byculla jail for women, was recently hospitalised after her platelet count dipped drastically, giving speculation that she was suffering from dengue. However, doctors at J J hospital later made it clear that she had not contracted dengue.
On October 6, Indrani was discharged and sent back to jail.