Is That George Zimmerman or Trayvon Martin Screaming for Help?

Every development in the Trayvon Martin case continues to generate widespread reaction, both heated and polarized. George Zimmerman claims he shot Martin in self-defense, and Sanford, Florida’s investigating officers gave Zimmerman the benefit of the doubt. One key piece of evidence is a scream for help recorded during a 911 call. Was that Zimmerman or Martin who cried out before the shot was fired? The Orlando Sentinel submitted the recording to a forensic voice consultant. Jeff Weiner reports for the Sentinel.