Joseph Harvey Jr. , a Maryland detective , is charged with second -degree murder . CNN say he fatally shot driver Walker , after an altercation . Joseph Walker , a sworn officer of the Hudson County prosecutor 's office , is accused of fatally shooting a motorist Saturday during an altercation off of Maryland 's Route 3 . Walker 's wife , kids were with him during the apparent road-rage incident , police say .
Joseph Harvey Jr. , a Maryland detective , is charged with second -degree murder . CNN say he fatally shot driver Walker , after an altercation . Walker 's wife , kids were with him during the apparent road-rage incident , police say .