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.

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.

Massachusetts State Police Col. Geoffrey Noble said that in the aftermath of the Karen Read case, the department will continue to work on improvements in oversight and accountability.