Donnette Sanz, 33, and 7 months pregnant was crossing the street when she was hit by a runaway school bus with no children in it.
"My brakes went out as I was coming from Valentine [Avenue]," van driver Walter Walker, 72, told The Post before cops picked him up. "The light turned red, and I couldn't stop . . . I tried to miss her.
"I tried to go behind her, but she stopped and moved back, and I hit her," he said, holding his head in his hands.
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Within seconds, more than two dozen strangers - from a nearby park, the busy sidewalk and a construction site - poured into the street to aid Sanz.
"Twenty of us started lifting up the bus - about 10 more came to help," said hardhat Madalina Diaz, 42, of Ardsley. "We didn't really communicate, we all just started lifting. We lifted it up and someone pulled her out.
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Sanz was rushed into the St. Barnabas emergency room at 2:18 p.m. She survived the emergency delivery, and died at 4:22 p.m., a spokesman said.
Her baby was taken to the neonatal intensive-care unit and placed on a ventilator.
The baby boy was named Sean Michael
Pregnant Woman Killed by Bus