The parents of the young doctor raped and murdered at Kolkata's RG Kar Medical College has told NDTV that they had lost trust in Chief Minister Mamata Banerjee after seeing the way the police handled the case. The Central Bureau of Investigation is at least making an effort, her father told NDTV in an exclusive interview. He also said he has handed a page of his daughter's diary to the CBI, but refused to discuss its contents.