Welcher spoke extensively about force, mass, and acceleration. He says damage to Read’s Lexus matches O’Keefe’s injuries.

Critical evidence that was logged a month after police collected it. Defense lawyers at the trial of Karen Read – ...

Karen Read's defense attorneys will cross-examine key accident expert Judson Welcher about his analysis of John O'Keefe's ...

The Karen Read trial is back in Norfolk Superior Court on Wednesday as crash reconstruction expert Judson Welcher is back on ...

Karen Read pleaded not guilty to murder charges in the death of Boston police officer John O’Keefe and is facing a retrial ...

Prosecutors’ crash reconstruction expert testified about the sudden acceleration Read’s SUV made and what injuries are ...

Dr. Judson Welcher said he believes the damage to Read’s SUV and relevant data was “consistent with a collision” with O’Keefe ...

So he tried to dress identically to John, but didn’t do anything else to mimic what the Commonwealth is accusing me of,” Read told reporters.

Weighing in on prosecutors' theory that Karen Read backed her SUV into John O'Keefe, Judson Welcher opined, “That is what happened.” ...

The prosecution in Karen Read’s murder retrial filed a motion on Wednesday asking Judge Beverly Cannone to remove a key piece ...

Judson Welcher also testified earlier in the day that Read's SUV reversed at 74% throttle around the time she's alleged to have hit O'Keefe.