A 68-year-old woman crossing the street in Brooklyn was killed Tuesday when a cement truck crashed into her, police said.

The 48-year-old man behind the wheel was waiting at a red light on northbound New Utrecht Avenue near the corner of 49th Street in Borough Park around 11:55 a.m. when the woman crossed in front of the truck, according to police and dash-cam video of the incident.

The startling video shows the diminutive woman, who was walking with a cane and had bags in her hands, slip in front of the towering truck and behind another car just before the light turned green.

As soon as the woman was in front of the truck, the signal changed and the truck driver moved forward, ultimately crushing the woman underneath his left tires, the video and photos show.

The driver of the truck, who was not immediately charged with a crime, stayed at the scene, cops said.

Further information about the victim was not immediately available.