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(NECN: John Moroney) - The woman accused of killing three colleagues at the University of Alabama in Huntsville was a suspect in a 1993 attempted mail bombing, according to a report by The Boston Globe.
The report broke the day after it was learned that Bishop fatally shot her brother in Braintree in 1986.
More than fifteen years ago, Bishop worked with Sylvia Fluckiger at Children's Hospital in Boston.
"I thought she was an odd-ball. Maybe socially a little awkward," Fluckiger said. "I felt she was a little bit sloppy working in the lab. But we were not friends. She came to do her experiments in our lab. I had my stuff to be done. We didn't hang out."
In 1993, Bishop and her husband, James Anderson, were reportedly questioned about a mail bomb that was sent to the Newton home of Harvard Medical School professor Dr. Paul Rosenberg.
Colleagues at Children's Hospital were suspicious at the time, because Bishop was apparently angry at Dr. Rosenberg, although no one knew why.
"The water cooler talk was -- if it was, and that was a big if -- she probably couldn't have done it, but her husband was a thinker. And I'm not accusing anybody of anything, but that's how people talked."
Sylvia and her husband Rudolph worked together at Children's Hospital in the early 1990s. She was a lab technician, he was a researcher. Bishop helped Rudolph Fluckiger write a research paper as a medical student.
"I didn't sit and have a meal with her, or sometimes one would get the stare when I'd like to discuss science, as if she wasn't really with it," Fluckiger said.
NECN attempted to reach Dr. Rosenberg, but he was not home on Sunday.
James Anderson told The New York Times that he and his wife were cleared in the mail bomb investigation and were never suspects.