Kolkata: CBI officers for the fourth consecutive day on Monday questioned the former principal of RG Kar Medical College, Sandip Ghosh in connection with their probe into the rape and murder of a woman doctor.

Ghosh reached the CBI’s city office at CGO Complex on Monday morning, an official said.

Ghosh was asked to specify his role after getting the news of the death of the doctor, who he had contacted and why he made the parents wait for nearly three hours, he said.

Ghosh has been questioned for several hours in the last three days since Friday by the CBI officers.

The officers of the central probe agency are also checking his mobile phone call list details as well as his WhatsApp chat list.