A 50-year-old man was found murdered in the fishing hamlet of Kuruchikuppam on Sunday morning.
Police identified the deceased as Lokanathan. He was attacked by a group with lethal weapons while returning home on his motorbike after a morning walk, police said.
He died on the spot due to the deep cut injuries sustained on his head.
Superintendent of Police C. Maran said a team had been formed to nab the culprits.