Read is accused of killing O’Keefe, her boyfriend and a Boston police officer, with her vehicle and leaving him in the snow outside a house in Canton, about 20 miles south of Boston. Her first murder trial ended in a mistrial last year after the jury said it could not reach a unanimous verdict.

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.