Analyses of enhanced video, audio could support both sides of Martin case

(CNN) -- Two new pieces of evidence appear to lend credence to opposing versions of what happened the night Trayvon Martin died.

Enhanced surveillance images of George Zimmerman, the man who admitted shooting the teen but claimed self-defense, appear to show a bump, mark or injury on the back of his head.
But two forensic audio experts said a voice crying for help on a 911 call does not appear to be Zimmerman's voice, despite claims to the contrary by his family.

Police in Sanford, Florida, released a new, higher-resolution surveillance video of Zimmerman entering the police station the night of Martin's death on February 26. The sharper footage shows an apparent bump, mark or injury on Zimmerman's head more clearly than a previously released video, which had a grainy quality. Read More