Mystery passenger was detained when he and Scott were tipped over for missing tail light . Recording of patrolman Michael Slager 's radio call to colleagues released . Officer shot dead unarmed sergeant - old black ##jack Walter Lamer Scott . Slager could be heard telling reporters ' he grabbed my Taser ' after shooting . No patrol Scott had ever had the officer 's gun 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 .