For the record, that girl in the video was named Neda. She was not a protester but was watching along side her father in front of their store. A Basiji aimed directly for the heart and took the shot. The doctor couldn't save her (his friend shot the video) and she died in 2 minutes. Her father is the one crying in the video.
For now, she has become the voice of the movement. Her name, in farsi, apparently means voice or call. Twitter's trending topics has her as 1. She wasn't the only casualty but her's has become the face and voice of the movement now.
"Think about how stupid the average person is. Then remember that half the people in the world are stupider than that." --George Carlin