A founding member of the Trinamool Congress (TMC) Pankaj Bandyopadhyay passed away at a city hospital on Friday after a prolonged illness, family sources said.
Bandyopadhyay, also former leader of the opposition in West Bengal assembly, was 72.
He is survived by his wife and a daughter.
"He was suffering from old age related ailments for quite sometime," a senior TMC leader said.
Bandyopadhyay joined the Congress during late 1960s and became an MLA from Tollygunge constituency in 1972 and 1996.
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He switched over to the TMC when it was formed in 1998. One of the closest aides of TMC supremo Mamata Banerjee, Bandyopadhyay was elected from the same constituency in 2001.
He was the chairman of the party's policy-making body for several years since the inception of the TMC.
Bandyopadhyay was elected the leader of the opposition, a post he had held till 2006.
However, he retired from active politics in that year.
"Saddened at the passing away of one of Trinamool's founder members, Pankaj (da) Banerjee. My condolences to his family and admirers," West Bengal Chief Minister Mamata Banerjee said in a tweet.
Senior Congress leader Adhir Ranjan Chowdhury also condoled the passing away of Bandyopadhyay.
Several TMC leaders went to the hospital to pay their last respects.
West Bengal governor Keshari Nath Tripathi expressed his grief at the demise of Bandyopadhyay.
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