According to sources, the former President collapsed around 6.30 pm and was taken to the hospital. He died around 7.30 pm, hospital sources said.
This is what Kalam tweeted just before leaving for Shillong.
A M Naik, chairman, L&T, said: "Dr Abdul Kalam, India's 'Missile Man' was a scientist and technocrat who endeared himself to all, and was ranked among India's best loved presidents. We at L&T are proud to have been closely associated with him in developing India's space and nuclear programs. On a personal note, I was very honoured that Dr Kalam came to Mumbai a couple of months ago and handed me a unique memento on my completing 50 years in L&T. His inspiring address on the occasion will be remembered by every L&T employee. The nation will remember Dr Kalam as one of India's finest Presidents."
N R Narayana Murthy, Infosys co-founder, said: "President Kalam was a true patriot and a statesman. As President he connected with and inspired so many people, particularly youngsters across the country. At a personal level, he was a very simple, kind, and genuine man - a great role model for our country. I had known him for nearly two decades and I join the country in mourning this loss."
Dr Y S Rajan, a friend of Kalam for 50 years, who have jointly written three books, said: "It was “typical of Kalam” that he worked till his last day."
In 1998, Kalam and Rajan wrote a blockbuster India 2020: A vision for the new millennium, a book that talked of a developed India by 2020. His wish, Rajan said, will not be fulfilled due to various factors, including the neglect of manufacturing and obsession of India in services.
Rajan, who is younger to Kalam by over 12 years, met Kalam when he was a science research fellow at the Vikram Sarabhai Research Centre in Ahmedabad. Both worked at Isro.
In October 2014, both friends wrote the book - Beyond 2020 - A vision for tomorrow’s India, which identifies with data the mistakes of the past and steps that India should take the country forward in the next two decades.
“We have done our job,” Rajan recalled Kalam, as saying after finishing the book. “If we all commit to achieve what he has set, it will be the best tribute to the great school.”
J Jayalalithaa, chief minister, Tamil Nadu, said: "It was with profound grief and sorrow that I learnt of the sudden demise of the distinguished Eleventh President of India, great inspirational scientist and a beloved son of Tamil Nadu, Bharat Ratna APJ Abdul Kalam. Former President Kalam was one of the greatest public figures of post Independence India. Starting from a very humble background, born into a poor family in Rameshwaram, President Kalam rose to the greatest heights through dint of sheer perseverance, hard work and brilliance."
"His contributions to India's space, missile and nuclear programmes are well known. A visionary scientist, he gave India the pride of place on the global stage of space technology and research.He reinforced India's stature as a responsible and self reliant nuclear power," she said.
"He led the Satellite Launch Vehicle Development team in the Indian Space Research Organisation. He led the Integrated Guided Missile Development Programme of the Defence Research Development Organisation with great success," she said.
"He has been a great source of inspiration for the people of this country and in particular for children and students. He wrote and spoke with great felicity for all Indians and the youth in particular. He became a great youth icon. He touched everyone with his simplicity and grace. He was a true patriot who placed the interests of the country above all else. His mind was full of ideas for harnessing technology for the benefit of the rural poor," she further added.
"I join the people of India and of Tamil Nadu in deeply mourning his passing away," she said.
Jamshyd Godrej, chairman, Godrej & Boyce, said: "His vision for India had no boundaries and challenges in our nuclear program and space program were approached with a can do attitude! He was an inspiration to me to take on technical challenges that seemed insurmountable! His humility and life story were an inspiration for a generation of young people."
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