Unless the gun was pointed at him, then no, he could not have done what you say. And because what we know is largely from the media, the facts are probably the opposite of what is being presented.
Remember what the media said about Trayvon? Curious if this story ever makes it into the light of day.
A shot gun was pointed at him, that was how they shot him and murdered him
I believe three shots were fired during that ordeal
That jogger had every right to defend himself at that moment they drew the shot gun.
Look up and research brandishing
If there's any justice in Georgia, this guy will be getting an injection soon.
(This doesn't actually apply, but in Georgia law, if someone doesn't enter your property illegally, you don't have the right to follow them of your property and chase them until you kill them.)