District Superintendent of Police Anil Kumbhare today said the accused were arrested last night. The victim, whose headless body was found last month, has been identified as Kalawati Ramasrey Gupta, a resident of Santacruz in Mumbai.
According to police, Kalawati's son, who lived in Uttar Pradesh, kept unwell, and somebody advised her to meet Sarvajit Ramdeo Kahar (57), a godman.
Ramdhani Kripashankar Yadav (33), who lived in the same area, took her to Kahar's house in the Airport colony in Santacruz in his autorickshaw on a few occasions.
The brothers allegedly decided to kill Kalawati.
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On November 16, 2013, they took her to Gulab Yadav's house in Nalla Sopara, saying that she was to perform some rituals which would cure her son.
During the ritual she was beheaded. Kahar's relative Satyanarayan alias Pardeshi Rambali Gound (48), his son Pankaj (22) and Yadav's friend Shyamsunder Jawahar Gupta (42) abetted the murder, according to the police.
The anti-superstition bill, championed by the slain rationalist Dr Narendra Dabholkar, was passed by the state Assembly yesterday.