Robert Mueller, former special counsel who investigated Russian interference in the 2016 presidential election, died Friday.

Mueller, also former director of the Federal Bureau of Investigation, was 81.

“With deep sadness, we are sharing the news that Bob passed away” on Friday night, his family said in a statement Saturday. “His family asks that their privacy be respected.”

MS Now first reported the news on Saturday.

Mueller concluded in 2019 that Russia interfered in the election in an effort to influence voters towards President Donald Trump’s 2016 campaign.