Some people who knew him scoffed at the government's assertion that Ivins sent the anthrax letters that killed five people and sickened 17 in the fall of 2001. But court documents indicate the outwardly mild-mannered Ivins had a menacing side.
Documents show that Ivins recently received psychiatric treatment, and that he was ordered last week to stay away from Jean C. Duley, a social worker who counseled him. In her handwritten application for a protective order, Duley wrote that Ivins had stalked and threatened to kill her and had a long history of homicidal threats.
Ivins, 62, committed suicide this week as federal prosecutors zeroed in on him as a suspect in the 2001 attacks. They were planning to indict him and seek the death penalty.
Ivins' brother Tom, who stressed that had not spoken to Bruce since 1985, was not shocked to hear that his brother was accused of making death threats, and he conceded the possibility that Bruce may have been the anthrax mailer.
"It makes sense, what the social worker said," Tom Ivins said. "He considered himself like a god."
Some who knew Ivins said the scrutiny of the investigation was too much for him to bear. But they also asserted his innocence.
"The relentless pressure of accusation and innuendo takes its toll in different ways," his attorney, Paul F. Kemp, said in a statement. "In Dr. Ivins' case, it led to his untimely death."
Ivins had worked for the past 35 years at the government's biodefense labs at Fort Detrick. For more than a decade, he worked to develop an anthrax vaccine that worked even when different strains of anthrax were mixed, which made vaccines ineffective.
Dr. W. Russell Byrne, a colleague who worked in the bacteriology division of the Fort Detrick research facility, said Ivins was "hounded" by FBI agents who raided his home twice, and he was hospitalized for depression earlier this month.
According to Byrne and local police, Ivins was removed from his workplace out of fears that he might harm himself or others.
"I think he was just psychologically exhausted by the whole process," Byrne said.
Still, Byrne did not think the probe would result in charges being filed. "If he was about to be charged, no one who knew him well was aware of that, and I don't believe it," Byrne said.
Neighbor Bonnie Duggan, who brought her daughter, Natalie, to Ivins' home near Fort Detrick on occasion to see the family's elaborate gardens, was also incredulous at the charges.
"It's not the Bruce that I knew," Duggan said. "It doesn't jibe with anything about the Bruce that was my neighbor."
The Duggans maintained their faith in Ivins even though FBI agents had watched his home for a year, sitting in vehicles with tinted windows.
"They said, 'We're on official business,'" said 16-year-old Natalie Duggan.
Ivins is survived by his wife Diane and two adult children: a son, Andy, and a daughter, Amanda, as well as two brothers, Tom, of Middletown, Ohio, and Charles, of Etowah, N.C.