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.

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.

Karen Read walked out of court a free woman after more than three years and two trials over the death of her boyfriend, Boston police officer John O'Keefe, who was found on the lawn of a fellow officer's home after a night of heavy drinking.