Watch Part II of Anderson Cooper's exclusive interview with Alan Chambers:
The audio from the 911 call on the night Travyon Martin died could shape the direction of the George Zimmerman trial. CNN's Randi Kaye reports.
Anderson Cooper goes beyond the headlines to tell stories from many points of view, so you can make up your own mind about the news. Tune in weeknights at 8 and 10 ET on CNN.
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