Judson Welcher, a crash reconstruction expert called by the prosecution, was back on the stand for a second day of testimony in the Karen Read trial.

Karen Read's defense attorneys cross-examine key accident expert Judson Welcher in a dizzying day of testimony.

CNN highlights about a dozen witnesses called over the last eight weeks, whose testimony illuminated key pieces of the theories presented by prosecutors and Read’s defense.

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

Crash reconstructionist Judson Welcher, a key prosecution witness in the Karen Read trial, completed three days of intense questioning on Thursday inside Norfolk Superior Court.

Karen Read arrived alongside her defense team at the Norfolk Superior Courthouse for the second day of testimony from Aperture LLC crash expert, Dr. Judson Welcher.

Prosecutors in Karen Read's Massachusetts retrial dressed an expert witness up as her boyfriend while a reenacting his alleged murder for jurors Wednesday -- and Read openly mocked the scenario ...

Evidence photos from Dr. Judson Welcher’s investigation are shown during Karen Read’s trial on May 27, 2025. (Pool) "So we’re going from the running clock to a real-world clock," Welcher said.

Karen Read’s Lexus SUV recorded 18 other “Techstream,” or trigger, events prior to Jan. 29, 2022, prosecution accident reconstructionist Judson Welcher testified Thursday.

Thursday's testimony in the Karen Read trial concluded. Catch a recap of the day here as the prosecution rested its case.

Judson Welcher, a crash reconstruction expert called by the prosecution, was back on the stand for a second day of testimony in the Karen Read trial.