SEMINOLE COUNTY, Fla. — WFTV just learned Friday morning about a picture of gunman George Zimmerman, taken just three minutes after the shooting that left 17-year-old Trayvon Martin dead. The picture reportedly shows cuts on the back of Zimmerman's head, with blood trickling down. Zimmerman, who shot and killed 17-year-old Martin on February 26 in a gated Sanford community, claimed he killed Martin in self-defense. Zimmerman is charged with second-degree murder for the shooting death of Martin. The picture would seem to back up Zimmerman's claim that Martin slammed his head against the sidewalk. That picture could be part of...