A Dalit woman who was allegedly raped and set afire by a man in Rajasthan's Barmer district died during treatment at a government hospital in Jodhpur, police said on Saturday.

The charge of murder was added to the FIR registered against the accused, Shakoor Khan, they said.

The Opposition slammed the Chief Minister Ashok Gehlot-led government over the incident, saying it shows 'jungle raj' is prevalent in the state.

The 30-year-old woman was allegedly raped and set ablaze by Khan at her house on April 6. The woman sustained around 50 per cent burns, according to police.

"The woman died late on Friday night at a hospital in Jodhpur where she was undergoing treatment. The accused has been arrested," said Superintendent of Police, Barmer, Digant Anand.

Khan, who hails from the same village as the victim, was arrested late on Friday night, the police said.

A case was registered under sections 376 (rape), 326 (voluntarily causing grievous hurt by dangerous weapons or means), 450 (house-trespass in order to commit offence punishable with imprisonment for life) of the Indian Penal Code (IPC) and other sections of Scheduled Castes and Scheduled Tribes (Prevention of Atrocities) Act, the police said.

Later, the charge of murder under Section 302 of the IPC was also added to the FIR, they said.

According to a complaint lodged by the victim's husband, Khan broke into his house on Thursday and raped his wife when she was alone at home.

The accused poured an acid-like chemical on the woman, a mother of two, and set her on fire before fleeing, the complaint stated.

Leader of Opposition in Rajasthan Assembly Rajendra Rathore blamed Gehlot for the "poor" law and order situation in the state.

The gruesome incident in which a married woman was raped and burnt alive is "a blot on the government", he said.

"It shows the jungle raj prevalent in the state. Chief Minister Ashok Gehlot, who is also the home minister, is completely responsible for the poor law and order in the state," he added.

Union Jal Shakti Minister and Jodhpur MP Gajendra Singh Shekhawat alleged the woman died due to a delay in treatment.

"The delay in treatment of the victim woman shows how concerned the administration and the government are about the lives of common people," Shekhawat said in a tweet in Hindi.

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