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Impromptu memorial to Trayvon Martin grows in Sanford, Fla.

Roberto Gonzalez / Getty Images

Raphael Cuevas, left, and Jashua Castro stop at a memorial to Trayvon Martin outside The Retreat at Twin Lakes community where Trayvon was shot by George Michael Zimmerman while on Neighborhood Watch patrol in Sanford, Florida. Zimmerman's claim of shooting the teen in self-defense has been questioned by community leaders.

Family photo

An undated handout photo of Trayvon Martin.

Msnbc.com staff and NBC News reports:

A grand jury will investigate the death of Trayvon Martin, an unarmed 17-year-old shot to death in a gated community in Florida on Feb. 26, state attorney Norm Wolfinger announced Tuesday.

Martin was shot by George Zimmerman, a resident who was patrolling the gated community in his car. Martin was returning from a convenience store where he had just purchased candy and iced tea.

Law enforcement officers did not arrest Zimmermen after the incident, citing Florida’s “Stand Your Ground” law that allows potential crime victims who are “in fear of great bodily injury” to use deadly force in public areas. Critics of the 2005 law call it the “Shoot first (ask questions later) law.

Related coverage:

In the wake of growing public outrage, the FBI and Department of Justice are now looking into the deadly shooting of an unarmed black teen in Florida by a neighborhood watch volunteer. NBC's Lilia Luciano reports.

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