Use of Force Investigation Unarmed Victims Charges Against Police Officers Fatal Police Shootings Investigation Process Mistaken Identity Acquittals De-escalation Techniques Murder Charges Lack of Evidence Justification Defense Officer-Involved Killings State Troopers Officer-Involved Shootings Sean Monterrosa Justification Officers Legal Conclusions Victim: 81-year-old Woman Philadelphia Police Department Wrongful Death Excessive Force Off-Duty Officers Vehicle Incidents Fatal Police Shooting in Nanterre Video Evidence