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She "always had some crisis going on" and seemed "eccentric in ways," he said.
One day, he said, he spotted her on her roof, scissors in one hand, trying to cut a wire that hung near her chimney.
"Susan! What are you doing?" he remembers yelling.
As he recalled it yesterday, Lindauer told him she believed she was under surveillance, that someone had secreted a camera in her house. And when she moved out a short time later, in 2000, the new owners found the windows nailed shut.
Another Silver Spring neighbor, Charles Glasgow, said yesterday that one of her roommates once knocked on his door, "panicked . . . upset and crying."
What had disturbed her that day, in the late 1990s as Glasgow recalled it, was correspondence she had found and a conversation she had overheard.
"She became frightened that [Lindauer] was involved with some foreign agents or terrorist organization," Glasgow, 55, said. "I assumed she might be a little delusional or on something, and I never saw her again."