The Karen Read trial on Friday focused on controversial testimony about the alleged collision involving Read's SUV and John O'Keefe. The only witness on the stand all day was Daniel Wolfe, a crash reconstructionist for engineering consulting firm ARCCA.

Read is accused of hitting her Boston police officer boyfriend with her SUV and leaving him to die in the snow in Canton after a night of heavy drinking in January 2022. The defense contends that Read did not hit anybody, arguing that investigators could have planted evidence and suggesting instead that O'Keefe could have been fatally injured from a fight inside 34 Fairview Road.

ARCCA expert Daniel Wolfe testifies

The ARCCA experts recreated several scenarios of the crash with speed and impact testing.

Wolfe testified that he was a

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