Anisetti Murali (around 45-year-old), was attacked with sickles by the three assailants in his room when he was alone, they said, adding that he died on the spot.
The trio fled the spot and later surrendered themselves in Hanamkonda police station, sources said.
Mr Murali represented 44th division of the civic body as the corporator.
One of the attackers is the son of Janardhan, the official said.
As per preliminary investigation, Mr Murali was killed over the old rancour, he said, adding further investigation is on.