Why does it even matter? Who cares?
So what if he is dead? So what if he is still alive?
Who cares if it was created by a govt organization?
Bitcoin has value and you spend it. end of story.
How would it affect any of you or even the market if he actually was dead? Or it wasn't who everyone thought it was.
Would you quit using it if you found out it was something other than what you thought?
A lot of people are very interested in the whereabouts of satoshi. Some people have spent weeks and months looking at his transactions and where the coins subsequently went.
I personally think the chances of him being killed are less then the average citizen being killed as he is very smart and can avoid many dangerous types of situations that end up killing people.