Wikileaks chief Julian Assange mentioned on Tuesday a staffer for the Democratic National Committee that was gunned down in Washington in July while discussing the risks taken by some of his sources.

“Whistleblowers go to significant efforts to get us material and often [take] very significant risks … a 27 year-old, works for the DNC, was shot in the back, murdered just a few weeks ago for unknown reasons as he was walking down the street in Washington,” Assange said in an interview on a Dutch television station, referring to Seth Rich, a DNC staffer who was shot multiple times on a nighttime walk in Washington, D.C.