Lawson was leaning in to attend to her child in the backseat when the dump truck rolled by on the narrow street.
On Thursday, the Arlington County Police Department put out a plea to two witnesses they believe were behind the dump truck that killed Lawson on Monday, but they didn't wait around for police.
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Cop Cruiser Crashes happen more often than you think in the Washington area. Are officers being held accountable? And should you be paying the price? The I-Team investigates MONDAY on ABC7 News at 11 after "Castle."