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

The Karen Read case is back in a Massachusetts courtroom on Monday as the trial enters a fifth week with an 18th day of witness testimony. A forensic analyst for the prosecution is going over the movements of Read's Lexus SUV on the night in question.

Prosecutors rested their case after Dr. Judson Welcher, a crash reconstructionist expert with Aperture LLC, was dismissed from the stand after three days. He most notably testified to the prosecution that damage to Read’s SUV was “consistent with a collision” involving O’Keefe if the vehicle was moving faster than 8 mph.

Prosecutors rested their case after calling a witness responsible for explaining exactly how the supposed collision between Karen Read's SUV and John O'Keefe took place.

Karen Read’s defense is set to call its first witness on Friday, marking a new phase in her retrial in the killing of John O’Keefe, her off-duty Boston police officer boyfriend whose body was found buried in the snow outside a home in Canton,

Karen Read's defense team challenges murder allegations in the death of Boston Police Officer John O'Keefe, as the prosecution rests its case with key testimony.