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Bruce E. Ivins, 62, who died Tuesday of an apparent overdose of prescription Tylenol mixed with codeine, lived in this Frederick, Md., house. According to his brother, Mr. Ivins, a top U.S. biodefense researcher, was being aggressively pursued by the FBI in connection with a series of anthrax mailings after the Sept. 11, 2001, terrorist attacks. (AP Photo/Rob Carr)