Mani was suffering from a lung ailment and was in the hospital for the past one week. He had been unwell since January.
Announcing the death, a doctor told the media that Mani's condition turned worse after 11.30 a.m. on Tuesday and he died at 4.57 p.m.
Mani's record of being the longest-serving legislator in the Kerala Assembly began in 1967 when he represented his home constituency Pala in Kottayam district -- from where he won a record 13 elections.
He often used to say that he has two wives: one is Kuttiyama and the other is Pala.
Although he won his first election in 1965, the Assembly was not convened and so he was not sworn-in. Two years later he became a legislator for the first time -- and remained so for 52 long years.
Mani first became a state Minister in 1975 in the C. Achutha Menon cabinet and since then he sat in the cabinets of E.K. Nayanar, P.K. Vasudevan Nair, C.H. Mohammed Koya, K. Karunakaran, A.K. Antony and Oommen Chandy.
He holds the state record of having presented 13 budgets.
He is survived by his wife, son Jose K. Mani, a Rajya Sabha member, and five daughters.
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