Sister of Rashtriya Janata Dal (RJD) MLA from Bhojpur district, Saroj Yadav, succumbed to her injuries which she sustained while resisting sexual assault on Monday night.
Shaili Devi was being treated in Indira Gandhi Institute of Medical Sciences in Patna.
40-year-old Shaili took a shared auto-rickshaw from Keshavpur when some youths boarded the vehicle on the way and started misbehaving with her.
When she resisted, one of the men attacked her with an iron rod and later threw her out of the vehicle after badly assaulting her. She was hit on her head.
Some local residents spotted her and rushed her to hospital in a critical condition. Shaili died on Tuesday during treatment.
The FIR lodged with the Chandi police station lists five people as accused, of which the identity of three is not known.
The MLA blamed the police for the rising crime and criticised the state government, saying when the sister of an MLA is not safe, how will the common man feel themselves safe.
After the incident, a large number of supporters of the MLA from Barhara blocked the Patna-Ara road and disrupted traffic for about four hours.