Barman, who had been suffering from liver ailments, was on ventilation since Saturday and died at around 11 am on Sunday at a private hospital in Nengaluru.
Barman is survived by wife, son and daughter, a CPI(M) statement said.
A popular left leader elected from Assembly constituency in Alipurduar district for the first time in 1991, Barman became the forest minister in 1996 and took charge of the Backward Class Welfare Department in 2006.
Till his death, Barman was the member of the Alipurduar CPI(M) district committee, the statement said.
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