Kolkata: Krishna Bose, an academician-turned-politician who was a three-time parliamentarian from West Bengal, died on Saturday due to age-related ailments. She was 89.Bose, the former Trinamool Congress MP from Jadavpur constituency in Kolkata, was unwell for quite some time. She died at a private hospital off the E M Bypass at 10.22 am, according to family sources.Bose was admitted to the hospital with irregular heartbeat on Sunday, and suffered a cerebral infarction on Monday and remained in critical condition, a doctor said.“She was suffering from age-related ailments for quite some time. She suffered her second stroke a few days ago and was admitted to the ICU,” her son Sumantra Bose said.Her other son Sugata Bose, historian and a former TMC MP said she was agile days before her death and had been active in two important programmes at the Netaji Research Bureau on January 23 and February 2.“However, due to irregular heartbeat, she was admitted to the hospital on February 16,” he said.Also read: A Graceful, Stoic and Eloquent Prime Minister: Vajpayee, as I Knew HimBorn on December 26, 1930, to constitutional expert Charu Chandra Chaudhuri in Dhaka, Bose taught at the City College in Kolkata for around 40 years. She headed the English department for several years and also became the principal of the college.She was married to Sisir Kumar Bose, nephew of Subhas Chandra Bose.Though Bose started in active politics as a member of Congress, she was close to Mamata Banerjee and switched sides when the TMC was formed.Bose was elected to the Lok Sabha for the first time in 1996 on a Congress ticket, then in 1998 and 1999 as a TMC candidate.She is survived by sons Sugata and Sumantra, and daughter Sharmila. Sugata, the Gardiner Professor of History at Harvard University, had won from the Jadavpur constituency on a TMC ticket in the 2014 Lok Sabha election.Bose was Chair of the Council of the Netaji Research Bureau and also headed the parliamentary standing committee on external affairs during her third stint as the MP.She had written several books, including ‘Netaji: A Biography for the Young’, ‘Ek Nambar Bari‘ ‘An Outsider in Politics’, ‘Itihaser Sandhane‘, ‘Charanarekha Taba‘, ‘Prasanga Subhaschandra‘, ‘Netaji: A Biography for the Young’ and ‘Emilie and Subhas: A True Love Story’.Her body was taken to her Sarat Bose Road residence in south Kolkata around 1 pm and then brought to the Netaji Bhavan on Elgin Road. She was cremated with full state honours on Saturday evening.Also read: Bengali Actor and Former MP Tapas Paul Dies of Cardiac ArrestChief Minister Mamata Banerjee told reporters that Krishna Bose had kept the legacy of Netaji Subhas Chandra Bose’s family alive through her work and was in a thick of things even a few days before her death.“I lost someone respected, loved & admired by me. Saddened & shocked to hear about the demise of Krishna Basu, ex-TMC MP & wife of freedom fighter Dr. Sisir Bose,” Banerjee tweeted. “Being a part of Netaji’s family, she was a revered social reformer, renowned poet & a courageous educationalist.”I lost someone respected, loved & admired by me. Saddened & shocked to hear about the demise of Krishna Bose, ex-TMC MP & wife of freedom fighter Dr. Sisir Bose. Being a part of Netaji's family, she was a revered social reformer, renowned poet & a courageous educationalist.(1/2)— Mamata Banerjee (@MamataOfficial) February 22, 2020“Krishna di was a mother to her son’s Sumantra & Sugata, daughter Sarmila as well as the whole Trinamool family. Her immense contribution to Indian society & Bengali culture will be revered for times to come,” the chief minister added.Krishna di was a mother to her son's Sumantra & Sugata, daughter Sarmila as well as the whole Trinamool family.Her immense contribution to Indian society & Bengali culture will be revered for times to come. (2/2)— Mamata Banerjee (@MamataOfficial) February 22, 2020Governor Jagdeep Dhankhar, who visited the Netaji Research Bureau to pay his tributes to Bose, said the death of a “towering giant” in West Bengal had left a void which cannot be filled.Dhankhar said Bose’s tenure as the chairperson of the parliamentary committee was significant and she would be remembered for “her sublimity, grace, knowledge and motherly love”.Bharatiya Janata Party state president Dilip Ghosh described Bose as a scholarly person whose death was a great loss for the country.Nobel laureate Amartya Sen said the demise of Bose was deeply saddening for the Bengalis.“The passing away of Krishna Bose is a matter of deep pain for any Bengali who loves his heritage. I consider myself as fortunate to have known her on a personal note,” Sen said.Rajya Sabha MP and Congress spokesperson Abhishek Singhvi, who was in the city, also condoled her death.