Alleged photo evidence to support Zimmerman`s case of self-defense in Trayvon shooting (WARNING: Graphic content)

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...ABC News exclusively obtained a photograph showing the bloodied back of Zimmerman's head, which was apparently taken three minutes after he shot and killed Martin. The photo could give credence to Zimmerman's claim that Martin had bashed his head against the concrete as Zimmerman fought for his life.

Photo credit: ABC News

...The exclusive photo obtained by ABC News shows blood trickling down the back of Zimmerman's head from two cuts. It also shows a possible contusion forming on the crown of his head. The original police report that night notes that the back of Zimmerman's head was wet, and that he was bleeding from the nose and head.

Zimmerman told police that night that he shot and killed the teenager in self-defense after Martin punched him and pounced on him. Zimmerman told police that Martin then bashed his head into the concrete sidewalk during the altercation that took place in the tidy middle-class development of the Retreat at Twin Lakes in Sanford, Fla.

Zimmerman was treated at the scene by paramedics, then cuffed and driven in a police cruiser to the Sanford police station. He was questioned for hours and later released. In police surveillance video obtained last month by ABC News, Zimmerman's wounds are not apparent, and there were no bandages on his head.

Zimmerman was not admitted to a hospital or given stitches the night of the incident.

The person who took the photograph of a bloodied Zimmerman, asking not to be identified, told ABC News exclusively that they did not see the scuffle that night, but did hear it. The person recalled seeing Martin's prostrate body on the wet grass and said the gunpowder burns on Martin's gray hoodie were clearly visible.

The photographer said that after the shooting, Zimmerman asked the photographer to call his wife. When the photographer asked him what to say, Zimmerman blurted out, "Man, just tell her I shot someone."

Investigators have seen the photo...

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