We know about Amelia Earhart, D.B. Cooper and Jimmy Hoffa. That is, we know that we don't know for certain — and might well never know — what became of the aviator, the hijacker and the labor union chief. As much as we might suspect an accident, an escape, foul play or whatever, some people, famous and hardly so, simply seem to disappear off the face of the Earth, their fates a mystery forever.
But not every cold case gets quite the attention these three have gotten. Here are 10 of those-- cases of people who shuffled off this mortal coil in mysterious fashion. (And speaking of Shakespeare ... even his death remains a bit of a cliffhanger.)