The CBI has filed a charge sheet against the prime accused, Sanjay Roy, in the rape and murder case of a trainee doctor at R G Kar Medical College and Hospital in Kolkata, officials said on Monday, reported news agency PTI.

In its charge sheet filed before a special court in Kolkata, the Central Bureau of Investigation (CBI) said Roy, who was working as a civic volunteer with the local police, allegedly committed the crime on August 9 when the victim had gone to sleep in the seminar room of the hospital during a break, they said on Kolkata doctor rape-murder case, reported PTI.