Shiv Sena supremo and champion of Maratha pride Balasaheb Thackeray died on Saturday afternoon, doctors attending him said. He was 86.
The Sena patriarch died at around 3-30 pm at their residence Matoshree.
He died after a respiratory arrest, the doctor said, urging reporters to not ask uncomfortable questions to the grieving family and respect privacy.
A heavy presence of police and rapid action force were posted outside Thackeray´s house, and other parts of the city fearing law and order problems.
The Centre has provided additional security forces to Maharashtra to assist the local administration in maintaining law and order.