Zimmerman’s mom just said it was Zimmerman’s voice on the tape screaming, and she knows even if she has nevber heard him screaming for his life before. She could recognize the anguish in his voice, and the fear.
The uncle ID’s the voice when not knowing it was going to come up on the television report, and he jumped up to say, “That’s George!” He claimed to recognize it even without knowing it was going to be broadcast and he did not know they were discussing it.