When you have an unsolved murder of a prominent DNC staffer in our capital during a contentious presidential campaign, I any many others think all possible angles should be looked into. Even the ones that might reflect badly on the DNC. Democrats and NeverTrumpers strongly disagree.
But you aren't doing that. You're casting aspersions and claiming that the only solution is a DNC hit job, with absolutely no evidence whatsoever, and in the teeth of the investigation that's been done so far, without any explanation - other than more fact-free anti-Clinton conspiracy theory - for why the cops would have totally dropped the ball on this one murder but not on any of the other murders that take place in DC. DC is not a safe place, even in the gentrified places people like this guy like to live. I had a friend who lived in Adams Morgan at one point who would leave her car unlocked at night and take the battery out each night because otherwise it would get broken into by some homeless guy wanting to sleep in it. Better to have to wash it out on the inside every so often than to have to constantly fix broken windows and locks. And that was in one of the better parts.
By all means, if you feel compelled to investigate, please do, but don't throw out dated conspiracy theories as if they were Gods own truth until you have the facts to back it up.