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. The trial is entering its second week as the prosecution continues to call key witnesses.

The Karen Read case is back in a Dedham, Massachusetts courtroom on Monday as the second week of trial begins.

Following testimony, Judge Beverly Cannone will hold a hearing on defense expert witnesses who found that John O’Keefe’s injuries weren’t consistent with being hit by a vehicle.