Video footage shot by a passer-by shows the woman, plastic bag in one hand and cane in the other, walking slowly across the avenue in front of the truck, which is waiting behind another vehicle at a red light beneath the elevated D train tracks.
The woman passes directly in front of the truck as the light changes and the truck begins to move forward, the footage shows. The woman, whose name was not immediately released, was pronounced dead at the scene, the police said.
The driver of the truck, operated by the concrete supplier Ferrara Bros., remained at the scene, the police said, and the investigation is continuing. Ferrara Bros., a division of U.S. Concrete, did not immediately respond to a request for comment.
Investigators blocked traffic on New Utrecht Avenue and closed the entrance to the 50th Street subway station for several hours while they examined the scene and interviewed the driver. The concrete truck remained parked behind yellow tape, surrounded by volunteers from two Orthodox Jewish community-service groups.
Shia Schwartz, who works at a Borough Park butcher shop, said that the victim was a regular customer at the store.
“She was a sweet lady,” Mr. Schwartz said. “Always the good word.”
Residents said the area, where New Utrecht and 12th Avenues and 50th Street converge, was thick with traffic. But they offered conflicting opinions about how safe the local streets are.
“We haven’t had any problems,” Saleh Al-Shaebi said.
Rene Marquez had a different take, describing the three-way intersection near where the woman was killed as chaotic and dangerous.