The Trayvon Martin 911 call has become a focal point of the George Zimmerman murder trial, the live stream of which continues Tuesday in Florida.
Persuading jurors about who is shouting on the 911 call that captured the fatal confrontation has become the primary goal of prosecutors and defense attorneys alike.
Watch the George Zimmerman trial live stream below:
Jurors on Monday were presented with conflicting testimony about whether Zimmerman's and/or Martin's voice could be heard screaming for help.
A parade of Zimmerman friends said they recognized his voice.