Investigators continue to search for documentary evidence in the controversial case of the US scientist who lead a double life, the depressed scientist who worked at the US Army Medical Research Institute for Infectious Diseases who committed suicide as the Justice Department was prepared to file criminal charges against him in the anthrax attacks that killed five people and sickened 17.

Researchers and legal experts hope that the double investigation – the first one conducted by the FBI on the one hand, and the second one conducted by a team of medical and military experts created by the Army to review safety procedures at the biodefense lab at Fort Detrick, where the scientist worked – will bring sufficient evidence to solve the case.

In a statement released Wednesday, Bruce Ivins’ attorneys said the scientist was innocent and emphasized there is no “concrete evidence” showing the scientist created the powdered anthrax and mailed it to media organizations and politicians after the September 11 attacks.

The Justice Department decided to keep the anthrax investigation officially open after it initially said the anthrax case had been solved.

The FBI is searching the computers used by Bruce Ivins at the C. Burr Artz Public Library on the evening of July 24 for clues about anthrax letters. Representatives for the FBI said the investigators will publish their research, but they wouldn’t say how soon.

Investigators said that between 2000 and 2006, Ivins had been prescribed antidepressants, antipsychotics and anti-anxiety drugs. Ivins’ psychotherapist said she requested a protective order from Ivins because she was scared to death according to her testimony at a Frederick County District Court hearing.