  Graphic: The neighborhood where Trayvon Martin was killed.  In
the last 45 seconds, there is a faint voice, a distant yell, and
the urgent dialogue between a woman and a 911 operator.
“There’s just someone screaming outside,” the caller begins on
the recorded line.  Listen to the audio  The 911 call that
recorded the last 45 seconds of Trayvon Martin’s life could be a
crucial piece of evidence in the case against George Zimmerman,
but what exactly was recorded is not clear.  Original audio:
First 911 call  |  View transcript   In the first seconds, there
is a yell in the distance. Audio forensics specialist Alan R.
Reich hears Martin shouting “I’m begging you.”      At the end
of the 45 seconds, right before the gunshot, Reich hears a high-
pitched “Stop!”      This spectrograph, which shows the vocal
characteristics of the recording, helped Reich phoenetically
break down the word ‘stop.’ See how Reich analyzed the recording
»   *By Reich with software   Click Here to View Full Graphic
Story  There is more