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.

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.

The agency did not mention the charge of gang rape, indicating that Roy alone committed the crime, according to the officials.

The CBI has kept the probe open.

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