Mrs Sharif, her husband and daughter left her bedside to return to Pakistan and be arrested on corruption-related charges just ahead of the July 25 elections, which their party lost.
Muttahida Qaumi Movement's Syed Raza Ali Abidi asked for early bail for Nawaz Sharif, his daughter Maryam Nawaz and son-in-law Captain (retd) Safdar on humanitarian grounds. "May God rest her in peace", Shehbaz Sharif, the former prime minister's brother, said on Twitter.
Sharif, his daughter Maryam and son-in-law Captain (retd) Muhammad Safdar are now serving jail terms in Adiala Jail in Rawalpindi after being convicted by an accountability court in a corruption case in July. Nawaz and daughter Maryam were informed by jail authorities of the former first lady's demise.
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Begum Kulsoom Nawaz held the office of PML-N on an interim basis in June, 2000, for a period of two years only. According to reports, her health deteriorated on Monday night and she was placed on life support.
With her husband jailed by General Pervez Musharraf, she broke through a police barricade that had been set up around her home in Lahore in July 2000 in an attempt to prevent her from leading a public rally.
The prime minister has directed the Pakistan high commission in London to assist in provision of all necessary facilities to the family of the deceased, said an official statement.
Begum Kulsoom Nawaz was born in 1950.
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At that time, he had said that he was leaving behind his ailing wife in Allah's protection and returning to Pakistan regardless of whether he was "taken to prison or gallows".
Begum Kulsoom served as first lady of Pakistan in her husband's three non-consecutive terms as prime minister from 1990-1993, 1997-1999 and 2013-2017.
President Dr Arif Alvi has expressed grief over the passing away of Begum Kulsoom Nawaz.
Both sons Hassan and Hussain reside in the United Kingdom and cared for her while Nawaz and Maryam attended near daily hearings of their corruption trial.
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