They said an upper caste person had reportedly "abused" a 19-year old Dalit boy by his caste name when he was at the premises of a temple in Thingalur in Erode district yesterday.
Chinnasamy, leader of an outfit named 'Dalit Viduthalai Katchi' objected to this, police said.
Chinnasamy's body was found floating in a well in Chellampalayam this morning and was brought to the Government Hospital for post-mortem.
However, the protesters dispersed after senior district and police officials assured them that necessary steps would be taken.
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On March 13, Shankar (22) and Kausalya (19), whose inter-caste marriage was opposed by their families, were attacked by a bike-borne gang with sickles in full public view in nearby Tirupur district, resulting in the death of Shankar.
Kausalya is presently undergoing treatment at the government hospital here under police protection.