Prosecutors retrying Karen Read in the killing of her boyfriend are laying out a minute-by-minute accounting of what they say happened at the suburban home of a fellow law enforcement officer where John O’Keefe was found unresponsive on a snowy morning three years ago.

Key witness Jennifer McCabe took the stand again on Friday in the murder retrial of Karen Read, the woman accused of fatally striking her boyfriend and Boston police officer John O’Keefe with her SUV.