Opposition Web sites and television channels, which Iranians view with satellite dishes, have repeatedly aired the video, which shows blood gushing from her body as she dies. By Monday evening, there were already 6, 860 entries for her on the Persian-language Google site. Some Web sites suggest changing the name of Kargar street, where she was killed, to Neda street.

Mehdi Karroubi, an opposition candidate for president, called her a martyr on his Web site “A young girl, who did not have a weapon in her soft hands, or a grenade in her pocket, became a victim of thugs who are supported by a horrifying intelligence apparatus.”

Only scraps of information are known about Ms. Ahga-Soltan — her friends and relatives were mostly afraid to speak and the government broke up public attempts to mourn her. She studied philosophy and took underground singing lessons — women are banned from singing publicly in Iran. Her name means “voice” in Persian, and many are now calling her the voice of Iran.