New Delhi: Senior CPI-ML (Liberation) leader Swapan Mukherjee, who played a major role in organising the party and its major campaigns, died in Chandigarh early on Tuesday after a heart attack, the Left party said.

The 63-year old CPI-ML (Liberation) Politburo member passed away at around 4:15 AM at a party colleague's residence in Chandigarh where he had gone for a meeting, the party said in a statement. Mukherjee is survived by his wife, a son and a daughter.