(Portland, OR) -- A Multnomah County grand jury has determined a Portland Police Officer won't face criminal charges over a fatal shooting in July. Officers responded to reports of a man and woman physically fighting near Southeast 148th and Clinton Street. As officers were arresting 19-year-old Jonathon Worth, he fired a shot from a gun and Officer Mina Cavalli-Singer returned fire killing Worth. The Portland Police Bureau's internal investigation into the shooting continues.