Pretty much had to happen some day
It is unfortunate that the numbskull decided to try a "prank" robbery against a guy with a gun, but given the amount of weapons that exist in the US, the only thing that surprises me is that it took this long.
That said, there are two things that bother me (aside from the whole death thing, obviously). One, this happened in what is supposed to be recreation park. The guy brought a gun to a recreation park ? WTF ? What is wrong with him ?
And two, and this is worse IMO, he just pulled out his gun and fired ? Couldn't he have drawn his gun and say something like "I suggest you GTFO" ? You know, give the guy a chance to reconsider ? But no, he just rambo'd it and got trigger-happy.
Somebody commented that he would have to live with that for the rest of his life. I'm not convinced that that will be a problem for him.