The main suspect, Bruce Ivins, died in an apparent suicide in 2008, his motive unknown .
Ezzell said Ivins was the one who examined an anthrax-laced letter that was sent to Sen.
CNN: Anthrax suspect, scientist, kills self as FBI closes in
Kemp said Ivins had "fully cooperated" with authorities and blamed the investigation for the researcher's death.
Ivins had been questioned previously by the FBI, as had many scientists assisting the FBI, the source said.
CNN: Anthrax suspect, scientist, kills self as FBI closes in
In a written statement, attorney Paul Kemp said his firm had represented Ivins for more than a year.
CNN: Anthrax suspect, scientist, kills self as FBI closes in
When he died, Ivins was under a restraining order on allegations of stalking, threatening and harassing a woman.
Court documents show that a judge issued a restraining order against Ivins on July 24, days before his suicide.
CNN: Anthrax suspect, scientist, kills self as FBI closes in
Ivins worked for decades in the U.S. Army Medical Institute of Infectious Diseases' biodefense lab at Fort Detrick, Maryland.
Ivins' brother, Tom, said the FBI questioned him about his brother about a year and a half ago.
CNN: Anthrax suspect, scientist, kills self as FBI closes in
Kevin Grubb said Ivins was found unresponsive on the floor of a bathroom.
CNN: Anthrax suspect, scientist, kills self as FBI closes in
Ivins' lawyer issued a statement Friday proclaiming Ivins' innocence in the anthrax investigation.
"Ivins was as mild as they come, " said Luann Battersby, a former microbiologist who worked with Ivins at Fort Detrick.
Investigators also traced the envelopes that contained the spore-laced letters to the Frederick, Maryland, area where Ivins lived, Taylor said.
Bushwhacked is a follow-up to Shrub, the book Ivins and co-author Lou Dubose wrote in 2000 about the presidential candidate Bush.
On Friday, sources told CNN that prosecutors might have sought the death penalty for Ivins' role in the anthrax mailings.
Hatfill and Ivins both worked at the bioweapons lab at Fort Detrick.
CNN: Anthrax suspect, scientist, kills self as FBI closes in
Kemp said Ivins was innocent and blamed his death on the investigation.
The court dismissed the order on Thursday, noting that Ivins was deceased.
In an interview with NPR's Bob Edwards, Ivins explains that she doesn't hate the former Texas governor, with whom she attended high school.
"For six years, Dr. Ivins fully cooperated with that investigation, assisting the government in every way that was asked of him, " Kemp said.
Authorities were looking at whether Ivins may have released anthrax as a way to test a vaccine he was working on, another official said.
Ivins, 62, died at a hospital in Frederick, Maryland, where he was taken after he was found on a bathroom floor at his home.
The FBI eventually concluded that Bruce Ivins, a microbiologist working at an Army lab in Maryland who committed suicide in 2008, had sent the letters.
In an ironic twist, the likely perpetrator of the attacks, Bruce Ivins, was allegedly motivated by his interest in reviving the anthrax vaccine program.
The meeting took place between prosecutors and a defense attorney even after authorities learned of Ivins' death, one of the sources told CNN on Saturday.
His case has fueled skepticism about the allegations against Ivins, and experts in the field have disputed some details that have emerged from the investigation.
Two sources familiar with the investigation said that on Tuesday, the day Ivins died, lawyers were to meet and discuss a possible plea deal for him.
The District Court of Maryland at Frederick ordered Ivins on July 24 not to threaten harm to the woman, contact her, or enter her home or workplace.
Neighbor Bonnie Duggan said it did not take "a rocket scientist" to figure out the FBI had been surveilling Ivins on and off for about a year.
At the time of his death, Ivins was under a temporary restraining order sought by a social worker who had counseled him in private and group sessions.
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