In the retrial of Karen Read, a key witness, Jennifer McCabe, described the frantic moments after finding Read’s boyfriend, officer John O’Keefe, unresponsive in the snow in January 2022. Prosecutors allege that Read struck O’Keefe with her SUV after a night of drinking and left him to die, leading to charges of second-degree murder and vehicular manslaughter; she maintains her innocence. McCabe’s testimony included Read’s erratic behavior at the scene and her admission of uncertainty about the incident, contributing to the trial’s chaotic atmosphere.