he could have just talked to him. >> reporter: whether or not trevor duely fired in self-defense is ateart of this case. also central to the story is duely's defense, florida's stand your ground law. ch allows a person to stand their ground and use deadly force if they fear someone could seriously harm them. here's what witnesses say happened on that september sunday in 2010. 41-year-old david james was playing basketball with his daughter here when witnesses say duely who lived right across the street started yelling at a teenager who was skate boarding to get off the court. that's when witnesses say james intervened. james yelled back to duely asking him to show where any signs say no skate boarding. duely then crossed the street to the park to confront james. a tennis player at the park, mike at witt, testified things turned ugly when duely reached for his waist band. the two men struggled on the ground before james was shot once through the heart. on the 911 call, witt is heard trying to help. >> sir, can you hear me? si, can you hear me? sir, can you hear me? he's shot in the ches