The body of the deceased, identified as Swethan, was dumped in a lake bed in Bahoor village of Puducherry. He had been released on bail in a criminal case here, police said.
Police of both the neighbouring Cuddalore district of Tamil Nadu and Puducherry are probing the incident. The body was shifted to the Puducherry government hospital for post mortem.
Police have registered a case and are investigating the gory crime.