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On September 19th, 2001, Bob Stevens, a photo editor at the tabloid, Sun received a letter containing a white powder at his office in Boca Raton, Fla. On October 5th he died in the hospital of anthrax poisoning.
Update: According to Debra Weierman, a spokeswoman for the FBI:
"It is an active case, and efforts to solve it have in no way been slowed"
...The FBI still has 17 full-time agents on the case.
Unsolved Mysteries
People Magazine