Former FBI Director Robert Mueller dies at 81

Former FBI Director Robert S. Mueller III died at the age of 81 on Friday night.

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

Who was Robert Mueller?

As FBI director, Mueller transformed the nation's premier law enforcement agency into a terrorism‑fighting force after the Sept. 11, 2001, attacks, according to The Associated Press. He led the bureau for 12 years, serving under Presidents George W. Bush and Barack Obama.

Mueller later served as special counsel for the Department of Justice, investigating ties between Russia and President Trump's 2016 campaign.