"Florida man killed in hurricane" = "A man from Florida (i.e., who lives in Florida) was killed in a hurricane. "Florida man killed..." is a writing style that one often sees in a newspaper or online news story. The style leaves out certain non-critical words to save space. People in the US sometimes joke that weird things happen in Florida. So, there may have been an implied joke in the article you saw. An example: "Florida man marries sister". The implied meaning would be: "Can you believe this?! Some crazy guy in Florida actually married his own sister!! People in Florida are crazy!!" (In reality people in Florida are nice - and no more crazy than anywhere else! :) )

As a native Floridian, let me say that people from Florida are no crazier than anywhere else in the US. Public opinion is easily swayed by the media.

"Florida man" is something of a running joke in the United States. It references the fact that often, you'll see a lot of very strange, silly, or disturbing news stories that take place in Florida. Often times the headline will begin with "Florida Man..." Followed by a ridiculous event. A few stories that come to mind are the time a man from Florida ate another man's face, or when a woman in Florida stabbed a pizza delivery guy for forgetting her garlic knots. Some people like to joke that the headlines are not about separate people in Florida, but rather one single person using a super hero allias- "Florida Man" as opposed to say, Batman or Spiderman.