MIAMI (CBSMiami) – The family of a Miami teen who was shot and killed while visiting Sanford is demanding answers as to why his killer has not been charged.

Trayvon Martin, 17, and his father, Tracy Martin, were in Sanford visiting his father’s fiancé Brandi Green on February 26th when the teen went to a convenience store to pick up a bag of candy for Green’s son.

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While walking back to Green’s townhome in the gated community of The Retreat at Twin Lakes, Martin was spotted by George Zimmerman, a member of the townhome community’s neighborhood watch, according to his parents. They say Zimmerman called 911 to report a suspicious person in the neighborhood.

Martin’s parents say from what they’ve heard, the 911 operator told Zimmerman that an officer was on the way and advised him not to approach the teen. Zimmerman, however, followed Martin and confronted him, according the teen’s parents.

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Martin and Zimmerman reportedly fought and at one point Zimmerman drew a gun and shot the teen, according to Martin’s parents. When police arrived, they questioned Zimmerman and released him. Martin’s parents said he was not arrested or charged in the incident.

Martin and Trayvon’s mother Sabrina Fulton are outraged and want answers. They say officials have refused to release the 911 tapes and have provided them no information regarding the case.

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On Friday, their attorney Benjamin Crump filed a public records lawsuit against the Sanford Police Department demanding release of the 911 tapes.