While it is quite a coincidence, remember that people are shot all the fucking time in America so the chances of this actually being not a coincidence are still quite high.
Yeah even if the cops aren't involved in this, there is a conspiracy that is real inasmuch as the material conditions that produce ghettoization, the rampancy of firearms, and such are all matters of policy with specific and intentional effects.
But it wouldn't surprise me if this was one of Guyger's goon pals