By Chandelis Duster , Carrie Johnson Special counsel Robert Mueller speaks at the Department of Justice Wednesday, May 29, 2019, in Washington, about the Russia investigation. Carolyn Kaster/AP hide caption Robert Mueller, the former FBI director and special counsel who led the high-profile investigation into Russian interference in the 2016 election and the possible obstruction of justice by President Trump, died on Friday at 81. "With deep sadness, we are sharing the news that Bob passed away," his family said in a statement Saturday shared with NPR. No cause of death was given. Mueller had been diagnosed with Parkinson's disease four years ago, his family told The New York Times in August. Trump, who openly despised Mueller and his investigation, celebrated his death on Saturday. "Good, I'm glad he's dead," the president posted on social media.…