FREDERICK, Md., Sept. 28 (UPI) -- A U.S. Army researcher found dead before formal charges were filed against him for the 2001 anthrax attacks left no suicide note, officials said.
Microbiologist Bruce Ivins died of a lethal dose of Tylenol and Valium, The Washington Post reported Sunday.
The FBI blames Ivins for the nation's most deadly act of biological terrorism. In 2001, he stuffed anthrax-laced letters into a Princeton, N.J., mailbox.
Before he was found unconscious, Ivins reportedly logged on to a public computer on the second floor of the library in downtown Frederick, Va., the FBI said.
Ivins, who was under FBI surveillance, went to a Web site devoted to the anthrax-mailings investigation. The page included comments from FBI Director Robert S. Mueller III, saying he was confident the anthrax case soon would be solved.
After Ivins returned from the library to his home outside the gates of Fort Detrick, Md., he "wasn't seen again," until paramedics carried him out of his home unconscious, FBI documents say.