Mueller was the second-longest serving FBI director in the agency's history. Robert Mueller, the former FBI director who led the bureau in the tumultuous decade following the Sept. 11, 2001, terrorist attacks, and who later served as special counsel overseeing the politically charged investigation into alleged Russian interference in the 2016 presidential election, has died, his family announced. He was 81. "With deep sadness, we are sharing the news that Bob passed away last night," a family statement said. "His family asks that their privacy be respected." The FBI Agents Association also mourned the passing of Mueller, noting he led the bureau "during a period of significant change and played an important role in strengthening its ability to confront evolving national security threats while maintaining its core criminal investigative mission." A spokesperson for the WilmerHale law firm, where Mueller had been a partner, commended him as an "extraordinary leader and public servant and a person of the…