Mark O'Mara, an attorney for former neighborhood watchman George Zimmerman, concluded his defense on Friday by showing a photo of a shirtless Trayvon Martin.

In his closing remarks, O'Mara presented the mostly-white, all-female jury with a life-sized silhouette to demonstrate Martin's height over Zimmerman, which he noted included a hoodie that the teen was wearing the night that he died.

"It's not in evidence, you don't even have to believe it's accurate," O'Mara said. "Relative physical abilities, that's what you have to look at and determine in a self-defense case."

At that point, the defense attorney displayed a shirtless photo of the 17-year-old African-American wearing only a hat with his bare chest and shoulders exposed. In the photo, which was originally released to the media by Zimmerman's defense team in May, Martin sits expressionless on a couch.

O'Mara continued to show the photo to the jury for nearly two minutes as he explained that autopsy photographs did not show Martin's "muscle tone."

"But here's him three months before that night, it's in evidence, take a look at it," he said. "Because this is the person... who George Zimmerman encountered that night. This is the person, who all of the evidence was attacked -- or attacked George Zimmerman, broke his nose or something close to it and battered him on something."

Watch this video from CNN, broadcast July 12, 2013.