David Dorn's death is reported in the story in THE GUARDIAN. This doesn't really lend support to your thesis that left-leaning news outlets are ignoring it. I cannot find any evidence the killer was part of the BLM protest. Or that this was anything but an opportunistic crime that, tragically, does happen amidst chaos.
Media outlets do decide which stories they cover by their relevance to ongoing narratives. You could probably point to cases where their choices miss the mark, or where they miss the point. I know I could.
But the notion that Dorn wasn't covered by all these disparate and independent media outlets ("CNN, MSNBC, ABC National, CBS National, NBC National, or a Major online AOL") because of liberal bias, like they all decided "Hey, we can't cover this story because it makes BLM look bad " is a pure goofy conspiracy theory.
Like, we've never seen the MSM over stories that make BLM look bad, right?
REDSTATEWARD must be happy though, that he is now not the only one wearing a tin foil hat on the forum. When someone else is doing it too he looks a little less stupid. Or so he thinks.