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Africa as he's known, reach for the officer's gun. meanwhile, investigators are analyzing images from two police body cameras as well as that cell phone. our jason carroll took the recording to an audio expert to see what it might reveal. here it is. [ gunshots ] >> reporter: key to the investigation in the lapd shooting will not be just what the officers did, but what they say. paul ginsburg is a recorded evidence specialist. he's been in the listening business for 40 years. think of him as an audio archaeologist, a man who digs for sound. >> it's a puzzle. each of my cases is a puzzle. >> re...

Officers could not subdue a man who was unarmed, and homeless, even after he was already tased. >> stephanie, appreciate it. more now on what the video we've been watching actually reveals, not just to expert eyes, but also expert ears. the audio angle now from our jason carroll. [ gunfire ] >> reporter: key to the investigation in the lapd shooting will not just be what the officers did, but what they said. paul ginsburg is a recorded evidence specialist. he's been in the listening business for 40 years. think of him as an audio archaeologist, a man who digs for sound. >> it's a puzzle. each ...

Jason carroll took the recording to an audio expert to see what it might reveal. [ gunshots ] >> reporter: key to the investigation in the lapp shooting will not just -- lapd shooting will not be just what the officers did but what they said. paul ginsburg is a recorded evidence specialist. he has been in the listening business for 40 years. think of him as an audio archaeologist, a man who digs for sound. >> it's a puzzle. each of my cases is a puzzle. >> reporter: first, listen to a portion of that amateur video captured by a by stanner in its original -- bystander in its original form. [ sh...