Prosecutors allege Karen Read struck her boyfriend, John O'Keefe, with her Lexus SUV outside of a get-together at another officer's home and left him to die.

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.

McCabe was questioned about her recollection of the hours leading up to the death of Read’s boyfriend John O’Keefe and the moment his body was found lying in the snow.