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Former Lok Sabha Speaker and ex-Maharashtra Chief Minister Manohar G. Joshi, a senior Shiv Sena (UBT) leader, passed away following a heart attack early on Friday morning. Joshi, 86, was rushed to the Hinduja Hospital in Mahim after suffering a heart attack late on Thursday. ‘Sir’, as he was popular in political circles because of his teaching background and a stern demeanour, succumbed during treatment around 3 a.m., plunging the state political fraternity into gloom.