Manju Govind Shete (45) died at the state-run J J Hospital on Friday night after allegedly being beaten up by a woman prison official.
"A case under IPC section 302 (punishment for murder) and other relevant sections was registered against six staffers of the Byculla jail," a senior official of Nagpada police station told PTI, adding a probe was underway.
Yesterday, over two hundred women inmates of the jail were up in arms after Shete died due to alleged thrashing by an official.
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