Special prosecutor Hank Brennan admits evidence mistake in Karen Read's murder retrial as defense requests mistrial, with legal experts divided on whether the error was intentional

Read, 45, is charged with second-degree murder in the death of O’Keefe, who was found outside the home of a fellow Boston police officer on Jan. 29, 2022. Norfolk County prosecutors say Read struck O’Keefe with her SUV while driving intoxicated. Read’s attorneys say her car never struck O’Keefe and that others are to blame for his death.