When I was a little kid, my grandfather bought me a book on unsolved mysteries. It was impossibly heavy, was well-above what people assumed I could read, and the subject matter wasn't exactly my mother's idea of appropriate.
Death is often a mysterious intrigue. Especially when there are obvious questions left unanswered. There are so many historical and famous figures over time, whose death leave the mind wondering? If you're a Dateline aficionado you know there is ALWAYS more to the story. And once time starts to accrue, that lessens the likelihood that answers will be found. And when it's the death of a well know person we all feel like we're a part of the investigation, like we can solve it.