From left, Lachaundrea Nabors, her brother Ervens Jr. Ford, 17, her dad Ervens Ford, and her brother Jaylen Ford, 12, march on in rally for Trayvon Martin in Sanford, Fla., March 26, 2012. Chad Pilster / PilsterPhotography

People hold up signs and bags of Skittles during a rally in support of Trayvon Martin at Freedom Plaza in Washington, on March 24, 2012. Jacquelyn Martin / AP

In this June 29, 2012 file photo, George Zimmerman, left, and attorney Don West appear before Circuit Judge Kenneth R. Lester, Jr. during a bond hearing at the Seminole County Criminal Justice Center in Sanford, Fla. Joe Burbank / ASSOCIATED PRESS

Trayvon Martin, the 17-year-old from Miami Gardens who was shot and killed by neighborhood watch captain George Zimmerman in Sanford, Fla., on Feb. 26, 2012. Courtesy of Martin family

Classmates of Trayvon Martin from Dr. Michael Krop Senior High march after school on March 23, 2012. They were protesting along Ives Dairy Road over the lack of arrests in the killing of Trayvon Martin, a Miami-Dade student killed by a neighborhood watch captain in Sanford, Fla. Chuck Fadely / Miami Herald Staff