Sybrina Fulton (L) and Tracy Martin, par

Sybrina Fulton (L) and Tracy Martin, parents of slain teen Trayvon Martin, listen to questions from the media at a press conference calling for justice and the arrest of George Zimmerman, during a press conference at the Washington, DC, Convention Center. Zimmerman, a neighborhood watch volunteer, who allegedly shot dead Martin in February will be charged on April 11, a source close to state prosecutors said. AFP Photo/Paul J. Richards (Photo credit should read PAUL J. RICHARDS/AFP/Getty Images)