Heine declined to comment on Ivins’ death.

Norman Covert, a retired Fort Detrick spokesman who served with Ivins on an animal-care and protocol committee, said Ivins was “a very intent guy” at their meetings.

Ivins was the co-author of numerous anthrax studies, including one on a treatment for inhalation anthrax published in the July 7 issue of the journal Antimicrobial Agents and Chemotherapy.

Just last month, the government exonerated another scientist at the Fort Detrick lab, Steven Hatfill, who had been identified by the FBI as a “person of interest” in the anthrax attacks. The government paid Hatfill $5.82 million to settle a lawsuit he filed against the Justice Department in which he claimed the department violated his privacy rights by speaking with reporters about the case.

The Times said federal investigators moved away from Hatfill and concluded Ivins was the culprit after FBI Director Robert Mueller changed leadership of the investigation in 2006.