Anne Marie Johnson Dade
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William Edward Caswell
This memorial consists of a red oak planted by the North Hills of Sligo Civic Association in September 2002. The tree grows near the house of Julia Daitch, sister of William Caswell. It is not in Sligo Creek park, but it was planted on public property where two neighborhood streets, Thornhill Road and Bruce Drive, meet.
William Caswell was killed at the Pentagon on September 11, 2001. He had a doctorate in elementary particle theory, had taught college physics, and worked for the Navy about twenty years.
For a time the paper pictured lay at the base of the tree, describing the man beloved by two sisters, and by parents who live in nearby Silver Spring.
William Edward Caswell
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Alison Thresher
On May 23, 2000, Alison Thresher, who was about to start work as a copy editor
at the Washington Post, did not appear at work; she was murdered. The killer went unknown. In 2018 the Washington Post reported new evidence about his identity. The following day the suspect, who was already in jail, committed suicide.
A photo taken in 2006 by James Thresher.
![]() (c) 2006, The Washington Post. Photo by James M. Thresher. Reprinted with Permission. |
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Sally Gagne March 2006 References |
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