Authorities say a San Francisco couple dispensed their own brand of justice by gunning down their 17-year-old daughter's pimp, the Los Angeles Times reported. 

Prosecutors say Barry Laprell Gilton, 38, and Lupe Mercado, 37, had attempted once before to kill 22-year-old Calvin Sneed in May but were unsuccessful.

In a second attempt, Sneed was sitting in his car on June 4 when Gilton fired a .40-caliber weapon from another vehicle, killing him, the Times quoted officials as saying.

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Gilton and Mercado each have been charged with one count of murder, one count of discharging a firearm into an occupied motor vehicle and one count of conspiracy to commit murder. Gilton faces an additional charge of possession of a firearm as a felon because of a 1995 drug-related conviction, the Times reported. They are being held on $2 million bail each.

According to Gilton's lawyer, Eric Safire, there isn't enough evidence to tie the parents to the murder.

"There is some circumstantial evidence, and there's certainly a motive, but there is no direct evidence that we've been made aware of," Safire told the Times.

The couple's daughter left home about a year ago and they discovered she was appearing in escort ads and working for Sneed. They tried to persuade her to return home, the newspaper said.

During an attempt on Sneed's life on May 27, Gilton fired a handgun at him while he sat in a car in North Hollywood, the Times quoted officials as saying. Police said Sneed was injured by shattered glass but refused to cooperate with police.

The weekend before the second shooting, officials said, the daughter visited a sick relative and argued with her parents, who insisted that Sneed leave, the Times reported.

Assistant District Attorney George Gascón said at a news conference that he felt the parents' anger and frustration, but that vilgilante justice will not be tolerated, the San Francisco Chronicle reported. 

"Killing someone in a situation other than defense of serious bodily injury or death is not an acceptable solution," Gascón told reporters.

 Authorities said Sneed was a member of the Nutty Block Crips in Compton, outside Los Angeles, and was the victim of a drive-by shooting last year, the Chronicle reported. 

His father, Charles Sneed, said his son wasn't in a gang but had been shot at many times, the Chronicle reported. He said he tried to convince the younger Sneed to change his ways and tried to stage an intervention but no other family member backed him, the paper reported. 

He said he would have returned the girl to her home and tried to persuade his son to stop being a pimp if he had known what was going on. 

"Weigh it up," he told the Chronicle. "You can call him the dirtiest low-down dog in the world, but if he wasn't killing anybody, he didn't deserve that."

  

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Updated at 7:48 a.m. ET: Florida’s 2005 “Stand Your Ground” law, which says a citizen doesn’t have to retreat before using deadly force against an attacker, could throw a legal wrinkle into the case of a neighborhood watch captain who shot to death an unarmed black teenager.

Police in the central Florida town of Sanford have said that 28-year-old George Zimmerman says he shot 17-year-old Trayvon Martin in self-defense during a confrontation in a gated community. Police have described Zimmerman as white; his family says he is Hispanic and not racist.

Police did not arrest Zimmerman after the shooting, but State Attorney Norm Wolfinger announced Tuesday the case will go before a Seminole County grand jury.

 

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Legal experts, gun-rights advocates and gun-control groups contacted by msnbc.com offered varying opinions on whether Zimmerman can avoid criminal charges under Stand Your Ground.

 

Richard Hornsby, an Orlando-based criminal defense attorney, says he thinks the grand jury is likely to indict Zimmerman for manslaughter, a second-degree felony punishable by up to 15 years in prison. Less likely is a more serious charge of second-degree murder, a crime that implies intent and that is punishable by up to life in prison, he said.

“This case isn’t even a close call to me. This is a case of a guy trying to be a vigilante,” Hornsby said. “It wasn’t like he was trying to avoid trouble. He brought a firearm to a fistfight.”

“My gut feeling he will ultimately be charged with some type of manslaughter charge,” agreed Philip Sweeting, retired deputy police chief for the Boca Raton Police Department and a law enforcement consultant who has testified  in court cases as an expert in police shootings and use of force.

“My gut reaction was this was an accidental discharge,” Sweeting added. “If you put yourself in the shooter’s position and you’re wrestling with this kid and a gun goes off, what are you going to tell the cops?”

If indicted, Zimmerman can raise the Stand Your Ground defense under the 2005 law signed by Gov. Jeb Bush. That legislation, derisively called the “Shoot First” law by its critics, gives Floridians the right to use deadly force to defend themselves in public places without first trying to escape. The National Rifle Association lobbied hard for the bill, saying it would allow citizens to better protect themselves from violent crime.

The key section of the law states:

A person who is not engaged in an unlawful activity and who is attacked in any other place where he or she has a right to be has no duty to retreat and has the right to stand his or her ground and meet force with force, including deadly force if he or she reasonably believes it is necessary to do so to prevent death or great bodily harm to himself or herself or another or to prevent the commission of a forcible felony."

Hornsby says the 2005 bill allows Zimmerman’s lawyers to argue to a judge – before any trial -- that the case should be dismissed on grounds he was permitted to defend himself. If the case isn’t dismissed, they could argue self-defense at trial.

Daniel Vice, senior attorney with the gun-control group Brady Center to Prevent Gun Violence, contends “Stand Your Ground,” combined with Florida laws allowing people to carry guns in public, have made it difficult to pursue criminal charges against people who shoot others and then say it was self-defense.

“All you have to say is that you reasonably believed you were threatened, and the only person who can dispute that is the person you have just killed,” Vice says.

"It's very hard to bring these types of cases because the 'Shoot First' law combined with public carrying of loaded guns protects people who engage someone and shoot to kill."

According to a 2010 review by the St. Petersburg Times, reports of justifiable homicide tripled after the law went into effect. It has been invoked in at least 93 cases with 65 deaths, used to excuse violence in deadly neighbor arguments, bar fights, road rage and even a gang shootout, the newspaper reported.

Lawyer: Trayvon Martin fearful in final call

Trayvon Martin case to go to grand jury

Gun-rights advocates say the facts to date are scarce and “Stand Your Ground” may or may not apply in this case.

According to transcripts of the 911 calls, a police dispatcher tells Zimmerman he doesn’t need to follow the teen, but Zimmerman apparently does anyway. So is he or the teen the one who feels threatened?

“The question again is whether he (Zimmerman) acted reasonably or not. At this point it doesn’t look good for him, but I don’t know what the heck happened and quite frankly no one else does either,” says Jon H. Gutmacher, an Orlando attorney, NRA-certified instructor and author of "Florida Firearms: Law, Use & Ownership."

“When you’re talking about law and whether things were legal and illegal, you can’t guess. You’re supposed to react to facts. The facts have been kept from the public and the press.”

Added Dave Workman, director of communications for the Citizens Committee for the Right to Keep and Bear Arms: “There’s a misunderstanding about what Stand Your Ground laws really do. No Stand Your Ground law translates to a broad permission for the use of lethal force when it’s not warranted.”

He added: “A lot of people have left the starting gate before they really know what has happened. A rush to judgment is never a good thing.”

The Associated Press, Reuters and msnbc.com's James Eng contributed to this story.

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