Roxana Sorina Buta, dark-eyed and lithe, hurried home from work as a waitress on May 24, scurrying through rain and 1:30 a.m. darkness toward the subway. She got to Broadway and stepped into the crosswalk when the light turned green.

At the same time a New York City dump truck rumbled eastbound on 14th Street and turned south on Broadway. On the video taken in a Citibank on that corner, you can see the truck making a fast, seamless turn. If you look very closely, you will also see a shadow flicker in front of the truck’s right headlight.

That was Ms. Buta, and the truck hit her square.

Ms. Buta, 21, an aspiring actress, the only child of immigrants from Romania, was no more.

Even at that hour, in the rain, witnesses screamed and yelled, and within a minute a police car pulled up. But the driver, who worked for the city’s Transportation Department, never stopped his truck; nor did he respond to pleas in subsequent days to step forward. Police investigators found him anyway. But to this day no one has been charged, or even gotten a ticket.