Regarding the mysterious death of late Dr Jyotirmoy Das

Regarding the mysterious death of late Dr Jyotirmoy Das (former director of Indian Institute of Chemical Biology, Jadavpur) in 1998. I know Dr Tushar Chakravarty (present scientist, IICB, CSIR) has something to do with the death. He and his thugs made it look like a death by natural causes. The body had been cremated, so no evidence at all. They covered it up very thoroughly. There was absolutely no enquiry or investigation at all. Dr Tushar Chakravarty is vindictive and malicious, this is the reason I can never come forward, because I am afraid to get killed on the street or endanger my family. Surprisingly Tushar Chakravarty is still working as a scientist in IICB, as if nothing ever happened. These beats behind a mask of a gentleman-familyman is living among us, but who can recognize them? West Bengal Police and CBI didn't even care to respond to my requests!