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witness in the trayvon martin case is changing his account of what happened that night. meanwhile, newly-released documents are raying more questions than answers today. florida officials released the last known video of martin. his autopsy results. pictures of zimmerman's wounds and much more. joining me live is karen desoto and defense attorney joey jackson. hi, guys, glad you're here. the witness originally told police, i want to be clear, he heard zimmerman crying for help the night of the shooting. now he's saying he's not sure who was doing the screaming. so how does this affect the prosecution's case? >> i think that was the one key thing everybody talked about, about how they heard these screams. and now, obviously, it's great that somebody was screaming and that somebody heard something, that way they can nail down the timing of it in the timeline, but now obviously you don't know who was screaming and what was said. so, really, what that has come down to is we know what time it

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