The CBI has filed its first chargesheet in the murder and rape case of a young doctor at RG Kar Medical College and Hospital. The main chargesheet, spanning 55 pages, names Sanjay Rai as the prime accused in the murder and rape. A supplementary chargesheet has also been filed, implicating Sandip Ghosh, the then principal of RG Kar Medical College and Hospital, and Abhijit Mondal, the then OC of Tala police station.