Ravinder Gosain, 60, was shot dead in the Kailash Nagar area when he was on his way home after an RSS 'shakha' or drill in the morning.
Shot at close range, he died on the spot. The attackers have not been identified.
Mr Gosain was a Sangh Pracharak or regional leader of the RSS in Ludhiana.
Mr Gagneja, a senior Vice President of the Punjab unit of RSS, was critically injured and died later in hospital.
(With Inputs From Agencies)