While I realize that some news outlets have fabricated/altered information to sensationalize the story, it's possible that ABC news (and Good Morning America) did not. Additional vetting may be in order, I suppose.
http://www.mediaite.com/tv/gma-shows-exclusive-images-of-george-zimmermans-head-injuries-the-night-of-trayvons-death/
GMA brought on ABC analyst and Mediaite founder Dan Abrams to discuss what these images might mean for Zimmerman’s case.
“There’s no way to be 100 percent certain of the photo,” said host Robin Roberts. “But ABC News did extensive vetting for the accuracy of the photo.”
“Yeah, before they’re even going to put it on the air, a lot of things done here,” Abrams explained. “They compared the background, for example, a number of pictures taken on the iPhone. The background does appear to be the scene. The fleece matches what he was wearing. The hair cut matches the hair of George Zimmerman. The photo has embedded data, showing that it was taken that day at a particular time. It was geo-tagged, etc. But look, in the end, it comes down to the reporting on it. And our reporters on the scene have been saying this has been a very reluctant person to come forward. This person did not want to give up this picture initially. They’ve been talking about how important it is to show this picture, etc. And that’s how it ultimately came out. We’ll have to see. Before something like this will be admitted in a courtroom, they would have to determine its reliability.”
(Added emphasis mine)
Obviously, the lighting of the photo makes the person look bald, but that may be attributable to poor photo quality/resolution.

What is the point of rules that are not enforced?