Dr. Karthikeyan is a Former: Director, Central Bureau of Investigation, Director General, National Human Rights Commission, (India), Special Director General, and Central Reserve Police Force.
Dr. Karthikeyan served as the Chief Bureau of the Investigation Team of the Central Bureau of Investigation to investigate the tragic assassination of Prime Minister Mr. Rajiv Gandhi. At the invitation of INTERPOL, France, he made an audio-visual presentation of the investigation before an assembly of top police officers, who commended Mr Karthikeyan for the model investigation.
