Trayvon Martin's father Tracy cries as he listens to the description of his son's death during George Zimmerman's trial in Sanford, Fla., on June 24, 2013
Gary W. Green / REUTERS
Trayvon Martin's mother, Sybrina Fulton, takes the stand during George Zimmerman's trial in Seminole circuit court in Sanford, Florida July 5, 2013.
Orlando Sentinel, Gary W. Green, Pool / AP
Trayvon Martin's mother, Sybrina Fulton, takes the stand during George Zimmerman's trial in Seminole County circuit court.
Christopher Morris for TIME
Trayvon Martin’s father Tracy Martin and mother Sybrina Fulton on March 25 in Sanford, Fla.
Trayvon Martin, in an undated photo released by his family
AP / AP
Witness Rachel Jeantel continues her testimony during George Zimmerman's trial in Seminole circuit court in Sanford, Fla. Thursday, June 27, 2013. Zimmerman has been charged with second-degree murder for the 2012 shooting death of Trayvon Martin.(AP Photo/Orlando Sentinel, Jacob Langston, Pool)
Andrew Burton / Getty Images
Protestors in support of Trayvon Martin march across the Brooklyn Bridge after attending a rally organized by the Reverand Al Sharpton in response to the non-guilty verdict for George Zimmerman on July 20, 2013 in New York City.
Joe Burbank / REUTERS
The mother of Trayvon Martin, Sybrina Fulton wipes her eye as she listens to the description of her son's death during the opening day of the George Zimmerman trial in Sanford, Florida, June 24, 2013.
Orlando Sentinel, Joe Burbank, Pool / AP
George Zimmerman, defendant in the killing of Trayvon Martin, arrives with his attorney Mark O'Mara, right.
Joe Raedle / Getty Images
A memorial in honor of Trayvon Martin is seen outside of The Retreat at Twin Lakes gated community where Martin was fatally shot on February 26th by George Zimmerman while on neighborhood watch patrol in Sanford, Florida.
17-year-old Trayvon Martin was shot and killed as he walked through a gated neighborhood, where he was visiting family in Sanford, Florida on February 26, 2012.
Carolyn Kaster / ASSOCIATED PRESS
President Barack Obama pauses as he speaks during the daily news briefing at the White House, Friday, July 19, 2013, in Washington, about the fatal shooting of Trayvon Martin by George Zimmerman.
LARRY DOWNING / REUTERS
President Barack Obama pauses as he talks about the Trayvon Martin shooting in the press briefing room at the White House in Washington, July 19, 2013.
Assistant District attorney John Guy addresses the jury in the Trayvon Martin trial in a Sanford Florida courtroom on June 24, 2013
Mario Tama/Getty Images
Protesters demonstrate at a rally for slain teenager Trayvon Martin on March 22, 2012 in Sanford, Florida.
Red Huber / Orlando Sentinel / MCT / ZUMAPRESS.com
Tracy Martin, left, and Sybrina Fulton, parents of shooting victim Trayvon Martin speak out, Friday, March 16, 2012, during a news conference in Orlando, Florida.
Christopher Morris / VII for TIME
Mother Sybrina Fulton and Father Tracy Martin, the parents of slain Florida teen Trayvon Martin, speak to TIME in Sanford, Florida on March 25, 2012.
Lucas Jackson / Reuters
Signs, balloons, packages of Skittles and cans of iced tea are piled into a memorial dedicated to Trayvon Martin near the site where he was killed in front of The Retreat at Twin Lakes community in Sanford, Florida, March 27, 2012.
AP / J. Scott Applewhite
Senate Chaplain Barry Black leads Congressional staff members and others in prayer at the "Hoodies on the Hill" gathering on Capitol Hill in Washington, Friday, March 23, 2012 to remember Trayvon Martin.