Mark O'Mara, the attorney for George Zimmerman, who is charged with killing Trayvon Martin, is set to speak to a gun rights group next month.

According to a notice by the Second Amendment Foundation, O'Mara will address the group at its annual conference, although it does not specify what O'Mara will be discussing.

"With new battles over individual rights in the age of terrorism, attacks on our gun rights from the UN, a number of Second Amendment cases in the courts and an important upcoming election, your attendance is critical," the e-mail reads. "The theme of Elect Liberty is most important as we set the pro-gun rights agenda for the year to come."

Zimmerman was charged with second-degree murder after he shot and killed Trayvon Martin, an unarmed teenager, in Sanford, Fl. Zimmerman claimed that he shot Martin in self-defense. The case sparked a furor after Zimmerman was initially released following the shooting, and many felt that Martin, whom Zimmerman said looked suspicious, had been racially profiled.

Zimmerman is expected to invoke the state's Stand Your Ground law, which gives wide discretion for the use of deadly force to citizens who feel "a reasonable fear of imminent peril of death or great bodily harm."

O'Mara took over Zimmerman's defense when his previous two attorneys resigned after they said they could not locate him and that he was ignoring their counsel.

Alan Gottlieb, the founder of the Second Amendment Foundation, has been an outspoken supporter of the Stand Your Ground law. But back in March, he told Chris Matthews of MSNBC that the law might not apply to Zimmerman. "He may very well use that to defend himself, but the truth is in this case, he was the pursuer," Gottliebe said. "He didn't stand his ground."

"I'm not sure that defense is going to work with him at all," Gottlieb said.

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  • A photograph of George Zimmerman taken the night he shot and killed Trayvon Martin in Sanford, FL.

  • The gun George Zimmerman used to shoot Trayvon Martin can be seen in this evidence photo.

  • George Zimmerman's gun and clip can be seen in this evidence photograph taken by Sanford police. Zimmerman shot and killed Martin after an altercation with the unarmed teen, who was returning to the house where his father was staying on February 26 after a trip to a nearby 7-Eleven.

  • George Zimmerman photographed by police the night he shot and killed Trayvon Martin in a gated community in Sanford, FL.

  • Cuts can be seen on the face of George Zimmerman in this photo taken by police on the night he shot and killed Trayvon Martin. Zimmerman claims that Martin attacked him and banged his head repeatedly on the ground, prompting Zimmerman to shoot the teenager in self-defense.

  • Cuts can be seen on the face of George Zimmerman in this photograph taken the night he shot and killed Trayvon Martin. Zimmerman says he shot Martin during an altercation in which Martin slammed his head repeatedly into the ground.

  • George Zimmerman, photographed by police on the night he shot Trayvon Martin in Sanford, FL.

  • Blood can be seen on the head of George Zimmerman in this police photo taken the night he shot and killed Trayvon Martin. Zimmerman claims he shot Martin, an unarmed teenager, in self-defense.

  • Blood can be seen on the head of George Zimmerman in this police photo taken the night he shot and killed Trayvon Martin.

  • Blood and bruises can be seen on the head of George Zimmerman in this police photo taken the night he shot and killed Trayvon Martin.

  • In this Feb. 27, 2012 image taken from a Sanford Police video posted on a website called gzlegalcase.com by George Zimmerman'sdefense team, Zimmerman speaks to investigators, (not shown) at the scene of Trayvon Martin's fatal shooting a day later giving police a blow-by-blow account of his fight with the teen. On the tape, Zimmerman did a reenactment of the scuffle with Martin in the moments before he shot the 17-year-old from Miami. (AP Photo/Sanford Police video via Zimmerman Defense Team)

  • This photo released by the Seminole County Sheriff's Office shows Shellie Zimmerman. Zimmerman, the wife of the Trayvon Martin shooter George Zimmerman, was charged with perjury and accused of lying when she told a judge that the couple had limited funds during a hearing that resulted in her husband being released on $150,000 bond. She was released on $1,000 bond. (AP Photo/Seminole County Sheriff's Office)