The first witness called by Karen Read's defense explained that there were few scenarios where John O'Keefe's phone locked before Read's car accelerated in reverse.

Dr. Judson Welcher said he believes the damage to Read’s SUV and relevant data was “consistent with a collision” with O’Keefe as long as the vehicle was moving faster than 8 miles per hour.

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.

I’m anxious,” Karen Read told reporters last week. “I’m ready to put on our case, which will be more robust than it was last year.”