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

Prosecutors in Karen Read's trial use crash expert data to support claims she hit boyfriend John O’Keefe with her SUV as ...

Judson Welcher, an accident reconstructionist from Aperture LLC, performed a test using an SUV similar to Karen Read's Lexus.

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

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

A prosecution witness played video of himself wearing a replica of John O’Keefe’s outfit while getting struck — albeit at ...

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.

Karen Read is accused of backing her SUV into her boyfriend and leaving him to die on a snowy night in the front yard of another officer's home.

Judson Welcher, an accident reconstructionist from Aperture LLC, who is key to the prosecution's case, took the stand Tuesday ...

Karen Read, right, and lawyer Elizabeth Little discuss developments during Read's murder trial in Norfolk Superior Court in ...

Karen Read pleaded not guilty to murder charges in the death of Boston police officer John O’Keefe and is facing a retrial after a jury was unable to reach a verdict last year.