that's my son that was yelling. >> when you heard the gunshot, that must have been wrenching. >> um... it left a hole in my heart. an explosion came in my heart when i heard the gunshot. >> reporter: zimmerman had a permit to carry a concealed weapon, a nine-millimeter handgun. trayvon martin was unarmed. he carried a cell phone, a can of iced tea and a bag of candy he had just bought at a seven 11. two weeks ago we asked sanford police chief why he was not in jail. >> mr. zimmerman felt that he, in self-defense, needed to fire his weapon. >> reporter: a 2005 florida law known as "stand your ground" allows deadly force when someone feels reasonably threatened. but sabrina fulton says the real issue here is race. >> if he had pulled the trigger and he was an african american male and he shot a caucasian man, a white man, yes, he would be in jail.