I absolutely feel bad for the wife and kids. I am sick of the people (my 19 year-old cousin on FB) who didn't know who he was yesterday and who posted a video of themselves crying about this trying to make people feel bad for them (instead of the wife and kids), but that's for the stupid shit we see on FB thread (or the Anthony Jeselnik thread).
Given how well this was pulled off apparently, I won't be surprised if there are others. They had the discipline to setup properly, take one shot, and then escape. That really cannot be understated - this was somebody who rehearsed it/trained for it. If they had missed, I have no doubt they would not have taken a second shot. How many of us have ever went to a range or wherever to do a little shooting, and hit exactly what we aimed at on the very first shot with no warmup? A very tiny target at that at that distance. I kind of suspect he was aiming center mass, but we'll never know. He was definitely patient and disciplined, from the closeup video I saw, he waited until Kirk had paused/was not moving around/or was squared up (prior to that, Kirk moved around a lot).
And I'm also wondering if what the cops recovered was meant to throw them off the trail. I mean, I don't want to go down the Jason Bourne/Jackal trail, but....it seems like a lot of the shooters we have in the US have mental health issues that leave them lacking in discipline before and after shit goes down. The nutcase that shot the two politicians in Minnesota, the cops fingered him almost right away as the main suspect because he had fucked up in a couple of different ways and put a "IT'S ME" sign on his back. This guy does not fit that category at all. Shit was thought out well in advance.