NEW DELHI — Four men were convicted of all charges on Tuesday in the rape and murder of a 23-year-old woman who was attacked when she boarded a bus here in December, bringing a bitter close to a case that broke open the subject of sexual violence in this rapidly changing society.

The last and most urgent question — whether any of the men will receive the death penalty — will be answered Wednesday, when they are to be sentenced at a morning hearing. The family of the victim has demanded death sentences, and much of the public seemed to share their anger, flooding the streets last year to demand swift punishment in the case. The police here were braced for protests that might follow the sentencing.

The crime stood out for its horror, even in this sprawling and chaotic city.

The woman was returning home from a movie with a male friend and boarded a private bus with a group of men, mostly working-class migrants who the police said had been drinking. While the bus circled Delhi, the men attacked the pair, knocked the woman’s friend unconscious and took the woman to the back of the bus and raped her, sometimes using a metal rod. The two were dumped off on the roadside, naked and bleeding.

The woman died two weeks later of her injuries.

Her death seemed to open a vault here, and nine months later reports of rape still saturate the country’s newspapers — whether because of increased attacks or increased reporting is not clear. Under pressure to respond to the surge of public anger, the government toughened laws on sexual violence. But the drumbeat of fresh reports offers little hope that this society has confronted the problem, and foreign women have become increasingly wary of traveling to India.