He was sent by Sanders to access clinton campaign things on that server to obtain information to help Sanders during 2016 election. He saw more on that server than he bargained for.
What he saw freaked him out to the point he copied to usb drive and sent it to Wikileaks. Wikileaks publicly published some of it in their clinton email leak, encrypted the really bad stuff, and upped to the blockchain as insurance.
Clinton didnt like that. Found out it was Seth Rich who physically accessed server. Clinton ordered John “Skippy” Podesta to dispose Rich. John Podesta then had his brother Tony Podesta take it from there. Tony Podesta hired 2 goons to kill Seth Rich. Which they did.
Julian Assange will be brought to the USA to testify to the above.
Even though he was a bernie bro aligned with a party and a candidate I diametrically oppose he did us all a favor and helped to save our great Republic. He was a real hero who lost his life for us all.
His name is Seth Rich.