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Abhay Nath Yadav died on Sunday night and will be cremated on Monday, they said.
Yadav was a prominent lawyer representing the Anjuman Intezamia Masjid Committee in the case.
The Allahabad High Court had last week adjourned the hearing of the case till August 3 challenging the maintainability of a 1991 suit seeking the right to worship by Hindu petitioners.