A 23-year-old Indian woman, whose gang-rape aboard a bus in New Delhi spawned days of mass protests across India, has died, according to a doctor who was treating her at a Singapore hospital.

The woman 'passed away peacefully' at 4:45 a.m. Saturday (3:45 p.m. ET Friday), with her family and Indian officials at her side, Dr. Kelvin Loh, chief executive officer at Mount Elizabeth Hospital, said in a statement.

The woman had been in 'extremely critical condition' since being admitted Thursday to the Singapore hospital, and Loh had said Friday that she'd 'taken a turn for the worse.'

'She had suffered from severe organ failure following serious injuries to her body and brain,' Loh said. 'She was courageous in fighting for her life for so long against the odds, but the trauma to her body was too severe for her to overcome.'

Authorities haven't released the name of the rape victim, but protesters are calling her Damini, which means 'lightning' in Hindi. 'Damini' also is a 1993 Bollywood film whose lead female character fights for a housemaid, a victim of sexual assault.

Read more: India gang-rape victim in Singapore for treatment; new protests hit New Delhi

The attackers assaulted the woman and her male companion on a bus December 16, robbing them of their belongings before dumping them at the side of a road, polic.