Teen's parents were "completely devastated" after hearing the 911 recordings
In some of the recordings, a voice in the background screams, 'Help, help'
The alleged shooter remains free as an investigation continues
He tells police he shot the teen in self defense
The family of a 17-year-old unarmed Florida boy gunned down last month is outraged that the shooter remains free.
Trayvon Martin, 17, was returning from the store to the Sanford home of his father’s fiancee when he was shot last month.
Authorities released seven 911 calls Friday, all of which describe hearing a gunshot.
The teen’s parents broke down when they heard the recordings detailing the last moments of his life, said their attorney, Benjamin Crump.
“They are completely devastated, and they are in unbelievable grief,” Crump told CNN affiliate WKMG.
Martin was carrying a drink and candy when George Zimmerman, a neighborhood watch captain, called 911 to report a suspicious man, authorities said.
The 911 dispatcher told Zimmerman not to confront him. But by the time police arrived, Martin lay dead with a gunshot wound in the chest, according to Sanford Police Chief Bill Lee.
911 tapes released Friday detail moments of terror in the neighborhood as residents made a flurry of calls describing a gunshot and a teen wailing for help.
In some of the recordings, a voice screams “Help, help!” in the background.
“There were gunshots right outside my house. There’s someone screaming, I just heard a guy shot,” a neighbor says. “Hurry up, they are right outside my house.”
Recordings mirrored the same details: A man outside was crying for help, followed by the sound of a gunshot.
“Hurry please … there’s someone screaming outside,” a neighbor whispers. “There’s a gunshot, hurry up … there’s someone screaming. I just heard a gunshot.”
In another call, a woman begs the dispatchers to send help, saying someone is “screaming and hollering” for help.
Moments later, she describes a light at the scene of the shooting.
“Oh my God …” she said, “There’s still somebody out there walking with a flashlight.”
Zimmerman told police he shot the teen in self defense, authorities said, and remains free as the state attorney investigates. Police said he has not been charged because there are no grounds to disprove his story of what happened.
“The evidence and testimony we have so far does not establish that Mr. Zimmerman did not act in self-defense,” the police chief said. “We don’t have anything to dispute his claim of self-defense, at this point, with the evidence and testimony that we have.”
Police released the tapes the same day the teen’s relatives said the they are outraged that Zimmerman remains free.
“It’s surprising. It’s shocking,” said Tracy Martin, father of Trayvon, shot dead in Sanford. “It lets me know that justice is just not being served here. All we want is justice for our son. We’re not asking for anything out of the ordinary.”
Numerous CNN attempts to contact Zimmerman were unsuccessful, and it is unclear whether he has retained an attorney.
“The NAACP has no confidence that, absent federal oversight, the Sanford Police Department will devote the necessary degree of care to its investigation,” the letter said. “We therefore call upon you to detail personnel to Sanford immediately to review the facts, ensure that the Sanford Police Department conducts an impartial, thorough and prompt investigation of the circumstances involving the death of this unarmed teen, and ensure that the responsible person is held accountable if a crime was committed.”
His father delivered a statement to the Orlando Sentinel this week saying his son moved out of his home after receiving death threats. George Zimmerman is Hispanic and grew up in a multiracial family, the statement says.
CNN’s Faith Karimi contributed to this report