DEDHAM, Mass. — A jury found Karen Read not guilty of second-degree murder and manslaughter charges Wednesday in the 2022 death of her Boston police officer boyfriend, a case that attracted legions of true crime followers who erupted in cheers when word of the acquittal spread outside court.

A jury cleared Ms. Read of charges related to the 2022 death of John O’Keefe, a Boston police officer, and convicted her only of drunken driving, in a trial that attracted wide attention.