Mystery passenger was detained when he and Scott were pulled over for missing tail light . Recording of patrolman Taser radio call to colleagues released . Officer shot dead unarmed 50-year-old black father Walter Lamer Scott . Slager can be heard telling dispatcher 'he grabbed my Michael Slager 's ' after shooting . No indication Scott had ever had the officer 's Michael Slager 's or used it against him .
Mystery passenger was detained when he and Scott were pulled over for missing tail light . Recording of patrolman Michael Slager 's radio call to colleagues released . Officer shot dead unarmed 50-year-old black father Walter Lamer Scott . Slager can be heard telling dispatcher 'he grabbed my Taser ' after shooting . No indication Scott had ever had the officer 's Taser or used it against him .