Jennifer McCabe is set to take the witness stand in Karen Read's second murder trial. 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.

A key witness in the retrial of Karen Read returned to the stand Wednesday for a second day of testimony, as she recounts the hours leading up to the death of Read’s boyfriend John O’Keefe – and the moment the off-duty Boston police officer’s body was found lying in the snow.

Karen Read was allegedly overheard uttering “I hit him, I hit him, I hit him” after finding her Boston cop boyfriend dead in the snow, a key witness testified Wednesday. The witness, Jennifer McCabe,