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His death also now reads clearly as either a circumstantial accidental overdose or suicide-while-intoxicated, not something that resulted from any serious thought or plan.
I, too, question how much thought or planning was involved. Mr. Ivins had to be an extremely intelligent man to land the job he had. If an intelligent person were to choose to commit suicide, I imagine they would research their potential method of choice. Some cursory research on death-by-acetaminophen/Tylenol reveals that it's quite a long and painful process. It destroys your liver quickly but it still takes at least 2 days and usually 4 days to finally die.
I'm not saying it's impossible (intelligence and suicide are generally considered to be mutually exclusive), but it certainly seems like a rather strange way kick the bucket...