A lot of people are worried about death, but really I think they are worried about being forgotten. So many memories just erased in an instant. The only possible remedy would be to 'engrave' those memories and stories into his songs, and then create a mystery which baffles the world for years to come. It makes sense doesn't it? Tupac was so intelligent, he would have had the ability to predict this. He would have known by leaving so many clues and hints in his lyrics, and by creating the Seven Day Theory, the world even to this day will be listening to his words in hope.
If this idea was true, it would explain just about everything - apart from the actual shooting itself. Now assuming Tupac died on September 13th 1996, we are left with two possibilities: Tupac was murdered, or he planned his death. Once again, your thoughts are welcome on this. But my personal opinion, is that Tupac planned his death. For someone living in such pain and suffering (according to his lyrics), it wouldn't be hard to give in to death, if it meant he would be perceived as a legend for decades to come. Tupac once said in an interview that he should've blown his brains out a long time ago. It is clear that he wasn't afraid to die, and so maybe he was willing to exchange his life for a piece of history.
Remember, this is just what I believe. Everyone has their own thoughts and views regarding Tupac's death. Maybe he is chilling on an island somewhere smoking a blunt. Or perhaps he really was murdered straight.