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The parents of Trayvon Martin, Tracy Martin and Sybrina Fulton, attend a rally in his honor at the Bayfront Amphitheater.

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Grace Miranda and other supporters of Trayvon Martin gather for a rally in front of Florida Sen. Marco Rubio's office to ask him to retract his support for Florida's "stand your ground" gun law following the Trayvon Martin killing in Miami, Fla.

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Protesters sign a portrait of Trayvon Martin at a demonstration in New York City.

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Trayvon Martin's parents, Tracy Martin and mother Sybrina Fulton attend a House Judiciary Committee briefing on racial profiling and hate crimes on Capitol Hill in Washington, D.C.

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Jajuan Kelley, of Atlanta, Ga., wears a Skittles wrapper over his mouth during a rally in memory of Trayvon Martin. Martin was killed while returning from a convenience store with a bag of Skittles and an iced tea.

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Jordan Miller, 10, holds a handmade sign alonside thousands of protesters rallying at the Georgia State Capitol.

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Feriha Kaya attends a rally demanding justice in Freedom Plaza, Washington, D.C.

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Supporters hold hands during a prayer vigil for Trayvon Martin at Allen Chapel AME church in Sanford, Fla.

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Protesters march through downtown before the start of a town hall meeting about Martin's death in Sanford, Fla.

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Rev. Al Shartpton speaks to thousands gathered before a rally at Fort Mellon Park in Sanford, Fla.

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Supporters of Trayvon Martin block traffic as they march through Union Square during a "Million Hoodie March" in New York City. Thousands of protesters turned out to demonstrate against the killing of the unarmed teenager by a neighborhood watch captain. The protesters took to the streets after holding a large rally in Union Square.

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Supporters of Trayvon Martin rally in Union Square during a "Million Hoodie March" in New York City.

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Rebecca Vaughns and others march together as they show their unity with the family of Trayvon Martin in Sanford, Fla. The Justice Department and the FBI opened an investigation into the death of the black teenager, and the local state attorney announced that he had asked a grand jury to investigate.

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A memorial to Trayvon Martin sits outside The Retreat at Twin Lakes community where Trayvon was shot by George Michael Zimmerman while on neighborhood watch patrol in Sanford, Fla. Zimmerman's claim of shooting the teen in self defense has been questioned by community leaders and a grand jury will examine the incident.