W. Mark Felt, who for nearly 33 years denied he was Deep Throat, also held a tragic secret from most of his family: It was suicide, not a heart attack, that felled his wife after years of strain from Felt's FBI career and ensuing legal troubles. In his new book, "A G-Man's Life: The FBI, Being 'Deep Throat' and the Struggle for Honor in Washington," Felt reveals for the first time that Audrey Robinson Felt, his wife of 46 years, shot herself in 1984 with his .38-caliber service revolver. The book, co-authored with John O'Connor, the lawyer whose Vanity Fair...