text: George Zimmerman, set to stand trial in the 2012 shooting death of teenager Trayvon Martin, on Tuesday waived his right to a "stand your ground" pretrial immunity hearing. Zimmerman's attorneys have decided they will try this as a self-defense case. 
  
  Florida's deadly force law, also called "stand your ground", was passed in 2005. It allows people to meet "force with force" if they believe they or someone else is in danger of being seriously harmed by an assailant. Under the law, a person can use deadly force anywhere as long as he is not engaged in an unlawful activity, is being attacked in a place he has a right to be, and reasonably believes that his life and safety are in danger as a result of an overt act or perceived threat committed by someone else. 
  
  In a pretrial immunity hearing, a judge would have ruled whether Zimmerman's actions were protected under the "stand your ground" law; a ruling in favor of the defendant would have meant that no criminal or civil trial could proceed. 
  
  Martin was shot and killed on February 26, 2012, while returning from a nearby convenience store to his father's fiancée's house in a gated community in Sanford, Florida. 
  
  Zimmerman, a neighborhood watch captain, acknowledged that he shot the unarmed 17-year-old, but said Martin physically attacked him and he fired in self-defense. Initially, no charges were pursued, and the case soon became the center of a national controversy. 
  
  Zimmerman was charged with second-degree murder on April 11, 2012. 