Karen Read was acquitted in the killing of her Boston police officer boyfriend John O’Keefe on Wednesday, vindicating a defendant who had claimed to be the victim of a sweeping cover-up across two divisive trials.

A jury cleared Karen Read of the three most serious charges brought against her, second-degree murder, manslaughter while operating under the influence, and leaving the scene of a crash resulting in death.

A jury cleared Karen Read of all but the least serious offense — drunk driving — following a lengthy trial for the murder of Boston Police Office John O’Keefe, her boyfriend. The verdict was