Just paged this today - it turns out that the whole Seth Rich conspiracy theory was pushed by the Kremlin

In her efforts to better understand where the conspiracy theories were coming from, Sines used her security clearance to access copies of two SVR intelligence reports about Seth Rich that had been intercepted by U.S. intelligence officials. She later wrote a memo documenting the Russian role in fomenting the conspiracy theories that she sent to the Justice Department’s national security division, and personally briefed special counsel Robert Mueller’s prosecutors on her findings.

“It appeared to me that it was a very clear campaign to deflect an ongoing federal criminal investigation,” Sines said. “So then you have to look at why is Russia doing this? … It’s not rocket science before you add it up and you go, ‘Oh, if Seth is the leaker to WikiLeaks — it doesn’t have anything to do with the Russians. So of course Russia’s interest in doing this is incredibly transparent.” The Russian strategy, Sines said, was diabolically simple: “Let’s blame it on Seth Rich. He’s a very convenient target.”