A photo posted online Monday, December 3, shows George Zimmerman with blood on his nose and lips. His attorneys say it was taken the night unarmed teen Trayvon Martin was killed in Sanford, Florida. Zimmerman, 28, faces second-degree murder charges in the death of Martin in Sanford, Florida, on February 26, 2012. Other evidence photos were released earlier this year: Sanford Police

Zimmerman says he shot Martin in self-defense. Martin's attorneys say he was shot and killed "in cold blood." Sanford Police Department

Zimmerman said that before he shot the teenager, he was "assaulted (by Martin) and his head was struck on the pavement," according to a police report. Sanford Police Department

According to a fire department report, Zimmerman had "abrasions to his forehead," "bleeding/tenderness to his nose" and a "small laceration to the back of his head" when he was treated at the scene. Sanford Police Department

In a photo released by the Sanford Police Department, Zimmerman's hands appear to be unmarked. Sanford Police Department

Prosecutors allege Zimmerman unjustly killed Martin, an unarmed teenager, after profiling him. Zimmerman has pleaded not guilty and claims self-defense. Sanford Police Department

Zimmerman's gun is displayed. The shooting raised questions about gun laws, as well as the merit of the "stand your ground" law in Florida and similar laws in other states. Sanford Police Dept.

Crime scene photos released by the Sanford Police Department show Trayvon Martin's cell phone at the scene of the shooting. Sanford Police Dept.

Evidence marker 2 shows a plastic sack found at the crime scene. Sanford Police Dept.