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Ramalingam was hacked to death by a group of individuals, hours after he reportedly questioned some alleged conversion attempts in the town.
The NIA has already apprehended some persons in connection with the murder, while a few suspects are said to be absconding. On Sunday, searches were held in different locations in the state in Madurai, Thanjavur, Tirunelveli and Mayiladuthurai districts among others, sources said without divulging details.