Overview: Anthrax Murders - When postal worker Norma Wallace came down with the sniffles, her doctors told her she had the flu and prescribed Tylenol. But when her symptoms worsened, doctors made a shocking discovery: Norma had been exposed to anthrax spores and was seriously ill. Then other cases of anthrax poisoning came to light, and the nation went on high alert: Someone was disseminating anthrax through the U.S. Mail. But who? Anthrax Murders (Unexplained Deaths)