State secretary of the BJP medical wing, Dr Aravind Reddy, was hacked to death in front of his clinic on Lakshmi Perumal street, in Kosapettai, Vellore, on Tuesday night while getting into the car.
Dr Reddy was to have his house warming function and new clinic opening ceremony on Wednesday.
Though he tried to run for his life, the gang got him.
Dr Reddy, 38, who contested the 2011 Assembly elections, is survived by his doctor-wife Sudha and their two children.