The Central Bureau of Investigation, CBI has on Wednesday taken up the investigation of the sensational murder of Bihar BJP MLA, Raj Kishore Keshari. The CBI has constituted a six member investigating team to enquire all aspects of this murder.A school teacher Rupam Pathak had stabbed Keshari to death at his residence in Purnea on 4th of this month.The Bihar government has handed over the investigation case to the CBI. Rupam Pathak had alleged MLA Raj Kishore Keshari of sexually exploiting her for the past three years.