Mumbai: Indrani Mukerjea, prime accused in the Sheena Bora murder case who was admitted in JJ Hospital on Friday night is still in a semi-conscious state, hospital authorities said.

As per preliminary examination and tests, doctors suspect drug overdose to be the reason behind her hospitalisation.

The hospital is awaiting reports of blood and urine tests from the forensic laboratory in Kalina to confirm whether Mukerjea had a drug overdose. She has been shifted from Emergency to the Critical Care Unit.

Sudhir Nanandkar, Dean of JJ Hospital, told CNN-News 18, "She was brought in a highly disoriented state. Her pupils were contracted which leads us to believe that this could be a case of drug poisoning/drug overdose, in addition to problems in the central nervous system."

The hospital, apart from carrying out preliminary blood and urine investigation as well as stomach wash, also did MRI and CT scan of Mukerjea on Saturday.

"A team of doctors are examining her. The MRI scan shows ischaemic changes in brains because of which there is insufficient blood flow to the brain," added Nanandkar.

According to hospital authorities, as per records, she has been taking anti-depressants and an overdose of that could have caused this. However, the doctors have not been able to gather any information from Mukerjea as she has been in a dizzy state ever since admission. Her condition however is stable, said the doctors.

"Whether the drug overdose was intentional or not and what kind of drugs she had taken can only be ascertained after the final reports. If it's ascertained that it's drug overdose, it could be due to anxiety pills or antidepressants in all likelihood" Nanandkar said.

Mukerjea was in the CBI court on Friday till evening in the ongoing trial in the Sheena Bora murder case.

She was admitted to JJ Hospital in 2015 also for suspected drug overdose. There were conflicting reports on her hospitalisation at that time.

Mukerjea was arrested in August 2015 in a sensational murder case in which she allegedly abducted and killed her daughter Sheena Bora in April 2012 and disposed her body in a forest in Raigad. Along with her, her husband Peter Mukerjea, former husband Sanjeev Khanna were arrested apart from driver Shyamvar Rai who spilled the beans on the murder that shook the nation.