Ivins claimed he knew who sent anthrax

The e-mail -- along with other correspondence showing that Ivins more recently mused about how to blind or kill a reality TV participant -- was among previously confidential investigative documents unsealed on Wednesday by a federal judge.

Ivins, 62, a microbiologist who specialized in handling anthrax at the Army's biological warfare research facility at Ft. Detrick, Md., died July 29 in a suicide. Justice Department prosecutors were preparing to charge him in connection with the anthrax mailings, which in 2001 killed five people and sickened or injured 17 others.

The unsealed documents had originally been submitted by investigators last month to win the judge's permission to search seven e-mail accounts that Ivins had maintained. Federal officials declined to comment on the newly unsealed e-mails, which had remained under wraps while investigators combed through Ivins' correspondence.

At face value, the new e-mails reinforce the view that Ivins was consumed with the criminal case closing in on him and, in the final months of his life, behaved in a way that suggested madness.

By early September 2007, the FBI had determined with the help of outside experts that the anthrax used in the mailings originated in a flask of material maintained by Ivins at Ft. Detrick.

But the bureau had not yet done all of the investigative work necessary to exclude as suspects colleagues of Ivins at Ft. Detrick and scientists elsewhere who also had worked with or had access to the material, labeled RMR 1029.

It was against that backdrop that Ivins, at 5:49 p.m. EDT on Sept. 7, sent the e-mail to himself, proclaiming that he had solved the case. Sent from one of the addresses he had registered, KingBadger7@aol .com, Ivins wrote:

"Yes! Yes! Yes!!!!!!! I finally know who mailed the anthrax letters in the fall of 2001. I've pieced it together! Now we can finally get all of this over and done with. I have to check a couple of things to make sure ... absolutely sure . . . and then I can turn over the info. I'll probably turn it over to my lawyer, and then he'll turn info over to the authorities."

Ivins added -- in an apparent reference to his colleagues at Ft. Detrick: