Trayvon Martin Neighborhood Watch Shooting: 911 Tapes Send Mom Crying From Room

March 16, 2012— -- Police recordings made the night a self-appointed neighborhood watch captain allegedly shot and killed an unarmed 17-year-old boy outside his stepmother's home sent the boy's mother screaming from the room and prompted his father to declare, "He killed my son," according to a family representative.

The series of emergency and non-emergency calls to police depict the apparent progression of events on Feb. 26 that led to the watch captain, George Zimmerman, 28, who is white, allegedly shooting Trayvon Martin, a high-school junior who is black, as the teen made his way home with a bag of Skittles and a can of iced tea.

The contents of the calls and the family's reaction to them were recounted to ABC News by a representative of the boy's family, Ryan Julison, and ABC News affiliate WFTV published excerpts from the 911 calls.

On one call to a non-emergency dispatch number, according to Julison, Zimmerman says, "He's checking me out," and then, "This guy looks like he's on drugs, he's definitely messed up."

"There's a real suspicious guy. This guy looks like he's up to no good, on drugs or something," Zimmerman can be heard telling the dispatcher.

"These a**holes always get away," he adds.

The dispatcher is heard trying to discourage Zimmerman, asking, "Are you following him?.. Okay, we don't need you to do that."

Within minutes, however, 911 calls are being made to police reporting the two are fighting.

"They're wrestling right in the back of my porch," one frantic caller says. "The guy's yelling help and I'm not going out."

On a second call someone's screams for help can be heard and what sounds like two gunshots.

The caller's boyfriend shouts, "Get down," and after the second apparent gunshot the shouts for help cease, Julison told ABC News.

"There's gun shots. Uh, I'm pretty sure the guy is dead out here, holy sh**," a caller says into the phone.

One witness describes Zimmerman after the shooting.

"He's out there with a flashlight. The guy is raising his hands up saying he shot the person," the caller said.

Martin's family listened to eight tapes, Julison said. At one point, Sybrina Fulton, Trayvon's mother, ran out of the room screaming and crying, barely lasting through half the tapes.

The boy's father, Tracey Martin, stoic and measured until then, erupted, Julison said.

"He killed my son," Martin said, according to Julison. "He killed my son. He couldn't control himself."

The Sanford, Fla., Police Department, relenting to massive public pressure, plans to release parts of the 911 tapes pertaining to the shooting, multiple sources told ABC News.

But police wanted the boy's family to hear the tapes before they were released to the public, a family source told ABC News.

A week after ABC News uncovered questionable police conduct in the investigation of the fatal shooting, including the alleged "correction" of at least one eyewitness' account, outrage that the shooter remains free is intensifying.

"It's surprising. It's shocking," said Tracy Martin, Trayvon's father. "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."

In an interview with ABC News, Martin's mother, Fulton, tearfully said she only seeks an arrest.

"Let a judge and jury decide the rest," she added.

In the meantime, outrage is spreading across the Internet.

The Seminole County State Attorney's Office was so bombarded by emails demanding that it prosecute Zimmerman that its website had to be taken down for 45 minutes, according to a spokeswoman for the office.

One of several petitions for Zimmerman's arrest has garnered more than 250,000 signatures on a change.org site, and at one point signatures were pouring in at the rate of 10,000 an hour, according to the website.

The outrage has been partly buoyed by calls for non-violent action by hip-hop luminaries, including Russell Simmons, who has been tweeting about the tragedy and warning against its possible vigilante violence.

"Trayvon Martin didn't die so we can create a race war he died so we can promote better understanding. We must start honest dialogue," Simmons wrote.