Prosecutors alleged Read hit her boyfriend, John O'Keefe, with her car outside another officer's home in January 2022 and then left him to die there during a blizzard.

Both sides agreed that the investigation into the death of Ms. Read’s boyfriend, a Boston police officer, was flawed and plagued by unethical and unprofessional conduct.

The head of the Massachusetts State Police offered a statement Thursday following Karen Read’s acquittal on murder and manslaughter charges.