Yes, FBI, I believe you. Sure.
http://news.yahoo.com/s/ap/20100220/ap_on_go_ca_st...
The FBI sought to close the book on its long, frustrating hunt for the killer behind the 2001 anthrax letters Friday, formally ending its investigation and concluding a mentally unhinged scientist was responsible for killing five people and unnerving Americans nationwide.
After years of false leads, no arrests and public criticism, the FBI and Justice Department said Dr. Bruce Ivins, a government researcher, acted alone.
Ivins killed himself in 2008 as prosecutors prepared to indict him for the attacks. He had denied involvement, and his family and some friends have continued to insist he was innocent.
Investigators had tried earlier to build a case against biowarfare expert Steven Hatfill, who had worked for a time in the same military lab as Ivins, but ultimately turned away from that theory and had to pay him a multimillion-dollar settlement.