evidence: The first known victim of the attacks, Robert Stevens, who worked at the Sun tabloid, also published by AMI, died on October 5, 2001, four days after entering a Florida hospital with an undiagnosed illness that caused him to vomit and be short of breath.[15][16] The presumed letter containing the anthrax which killed Stevens was never found. Only the New York Post and NBC News letters were actually identified;[17] the existence of the other three letters is inferred because individuals at ABC, CBS and AMI became infected with anthrax. Scientists examining the anthrax from the New York Post letter said it was a clumped coarse brown granular material which looked similar to dog food.[18]