Marina Marraco tweeted this just one hour ago:

"Seth Rich's family hired former @DCPoliceDept detective & tells @fox5dc tonight: there IS evidence Rich WAS "emailing" w/ @wikileaks"
https://twitter.com/MarinaMarraco/status/864296359754698753

An interesting reply involves one of the Awan brothers that George Webb is talking about in his last video (https://voat.co/v/pizzagate/1862358)::)

"If DNC turned over server FBI would see Seth's footprint, also Imran Awan & co who had complete access/password to DWS devices." https://twitter.com/ElectionJustice/status/864308649577115648

EDIT: Here's the story, with interview on video: http://www.fox5dc.com/news/local-news/254852337-story

Relation to Pizzagate: if the DNC hack was an insider job, then trying to hide the evidence might very well be motivated by the will to hide more nefastous details.