In a major development in the murder case of rationalist Narendra Dabholkar three years ago, the CBI on Wednesday named a right-wing medico as the alleged prime conspirator.The CBI has claimed that the chief conspirator as ENT specialist Virendra Tawde - of Hindu Janajagruti Samiti and also linked with the Sanatan Sanstha. He was arrested on June 10 and is now in judicial custody.It has also identified Vinay Pawar and Sarang Akolkar - both absconders - as Dabholkar's killers in a 40-page chargesheet filed before a Pune court on Wednesday."The motive for the murder of Dabholkar was allegedly the long enmity/hatred that existed between the two private organizations headed by Dabholkar in Satara and Tawde in Kolhapur," the CBI said.Dabholkar, a renowned rationalist and founder of the Maharashtra Andhashraddha Nirmoolan Samiti (MANS), was shot dead on August 20, 2013 while on a morning walk in Pune.