The Orlando Sentinel reports Monday that witnesses lent support to the version of events George Zimmerman gave police after he shot and killed the unarmed Trayvon Martin, claiming self-defense under Florida's "Stand Our Ground" law. But given how skeptical many have been about the police investigation that left Zimmerman charged with no crime, and with many more suspecting he acted out of racial bias, we're left wondering just who these police witnesses are, where they went, and what they said.

The conflict over just what happened when Zimmerman shot Martin hinges on a minute or so missing from the record when the two interacted leaving Martin dead and Zimmerman bruised and bloody. The Sentinel's Rene Stutzman reports on the key moment in the police investigation:

Zimmerman fell to the ground and Trayvon got on top of him and began slamming his head into the sidewalk, he told police.

Zimmerman began yelling for help.

Several witnesses heard those cries, and there's been a dispute about from whom they came: Zimmerman or Trayvon.

Lawyers for Trayvon's family say it was Trayvon, but police say their evidence indicates it was Zimmerman.

If the police's witnesses really are united in their support for Zimmerman's side of the story, that'd be very helpful in his defense case should he be charged, and many already pointed to the story on Twitter to suggest that people are overreacting in their suspicion that Zimmerman isn't telling the truth. But, of course, the police investigation has already caused enough skepticism to force the police chief to step down. And so, New York Times columnist Charles Blow tweets what many reading this story Monday are thinking: "Where are these witnesses?"