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The "attempted murder" was remote and I wouldn't bet on it. Duley's report is all we have and she may have been coached.
When she initially reported threats, he was hospitalized (voluntary admission) but he signed himself out after, I think, 6 days. Why didn't they keep him? Maybe they thought he wasn't crazy or maybe the powers that be didn't mind if he suicided. Sheppard Pratt is supposed to be a decent place but I don't know who was pulling the strings. Duley didn't file for restraint order until Ivins was out of he hospital for eight days. Please don't ask me why. (Don't hold me to it but I think I saw someplace it was suggested by the FBI -- maybe so they could feed a lot of lurid stuff to the MSM through her without "breaking rules" about divulging information on folks who haven't been charged with anything.)
Anthrax isn't a good way to go and he was at home so exposing others would be a problem. Tylenol isn't so hot either. He claimed to Duley he had a gun and now FBI is claiming that as well. Doesn't sound like a violent man to me, may have gotten the gun for protection, not to kill himself. He must have been terrified.
Have heard no evidence aside from Duley that he was a "revenge killer." Suspect she was fed that by someone else or had a fevered imagination.
Here's the link for the audio. See what you think of it.
http://graphics8.nytimes.com/packages/audio/national/20080802scientist.mp3
Bizarre seems as good a word as any.