The trial for George Zimmerman, the Florida neighborhood watch captain accused of murdering teen Trayvon Martin while on patrol, begins Monday with jury selection.

The February 12, 2012, incident in central Florida sparked a fierce national debate about such issues as gun control, equal justice and race after Zimmerman, who is Hispanic, fatally shot Martin, a black teenager.

There is no disputing that Zimmerman fired his 9-mm. handgun after calling police, exiting his pickup truck to follow Martin, then getting into a fight with the 17-year-old on a rainy night inside the gated Retreat at Twin Lakes community.

The 29-year-old Zimmerman, who had a concealed weapon permit, has admitted to shooting Martin in the chest.

But Zimmerman says the teen circled back and attacked him as he walked back to his truck – punching him in the face and slamming the back of his head into the sidewalk.