WASHINGTON - Months after the anthrax attacks of 2001, government scientist Bruce Ivins offered to help investigators trace the origins of the deadly powder that had spread through the mail, killing five people.

Years later, Ivins would be named as the sole suspect in the FBI’s investigation of "Amerithrax," the biggest biological attack in U.S. history.

Ivins, an Army bio-defense researcher, was never charged with the crime. He committed suicide in July 2008, intentionally overdosing on Tylenol as the Justice Department was preparing to indict him for the attacks. He was 62 years old.

Ivins had denied involvement, and his lawyer and some colleagues have maintained he was an innocent man hounded to self-destruction. In the years since his death, new evidence has cast doubt on the

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