George Zimmerman has pleaded not guilty, plans to prove self-defense
As the trial of George Zimmerman approaches, a key item of evidence in the case is being questioned.
Audio analysts have issued the theory that cries and shouts heard on the 911 tape could belong to the defendant and not the victim.
Some experts believe that the voice screaming on the emergency call could belong to him, while others are convinced that they can hear Martin.
According to Action News Jax, Zimmerman is backed up by his father, who stresses that the shouts belong to his son.
The horrifying screams are caught on the 911 recording of a call made by a neighbor, and the witness has suggested that the victim is yelling for help.