This Wednesday, April 11, 2012 booking photo provided by the Sanford Police Department shows George Zimmerman. Zimmerman, 28, the neighborhood watch volunteer who shot 17-year-old Trayvon Martin, was arrested and charged with second-degree murder Wednesday after weeks of mounting tensions and protests across the country. His attorney, Mark O'Mara, said his client would plead not guilty. (AP Photo/Sanford Police Department)