Mukherjee, 69, a former CPI(M) Rajya Sabha member from West Bengal and a senior leader of the CITU, breathed his last at around 7:40 AM at Ganga Ram Hospital, Tapas Sen, CITU General Secretary, said.
He was a bachelor.
Mukherjee, who did his electrical engineering from Banaras Hindu University, was admitted to the hospital recently after he complained of stomach pain. Later, he was detected with cancer in the pancreas.
He underwent a major surgery about a week ago and was shifted from ICU two days ago. His condition deteriorated this morning.
Mukherjee was first elected to Rajya Sabha in 1994 and was a member of Parliamentary Committees on Energy, Public Undertakings, Petroleum and Chemicals, Transport and Tourism, Petroleum and Natural Gas and Power.