Neighborhood watch volunteer George Zimmerman turned himself in Wednesday to face a charge of second-degree murder after a Florida special prosecutor announced she had concluded that his claims of self defense were not supported in the shooting death of unarmed 17-year-old Trayvon Martin.

Special prosecutor Angela Corey’s announcement marked a turning point in the high-profile case, as weeks of outrage and speculation about Zimmerman’s motives culminated in his arrest — something that Martin’s family and their supporters have argued for since the Feb. 26 shooting in a gated community in Sanford, Fla.

But Zimmerman’s new lawyer, Mark O’Mara, said his client will plead not guilty, and he is “hoping that the community will calm down” after the intense scrutiny of the case in the community and the media drove Zimmerman into hiding.

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