I think there were messages from the future in his music, thats how he knew he was going to die. he thought it to be from the Illuminati, so he went out against it by saying KIlluminati. can't find the lyrics or the song but wasn't it "the prophesy is getting clear, lock and load and disappear."
Or listen to the first part of better days the intro before still ballin, the lady says "its interesting how the message in these songs is still relevant today."
as for the I in Illuminati, you should know what that means by now.
Tupac said in the 3rd song when we ride, second verse first line" take a journey threw my minds I(or eye).
My take on the Illuminati is that they are trying to find the bad seed that sent this world into the hell that it is. They are trying to find just one to blame, thats how they get all thier power, threw the eye or I. The person that can acount all of his life, the person who is sorry for what he has done and does not have anything. They blame the poor and meek for the fall of this world, because they believe the greed will prosper this world or this country.
as far as tupac's death, i think alot of it had to do with him becoming a politician. He came up from nothing had nothing(no kids, not much fams, thugs as friends). and i think this was fear to the Illuminati and everyone else in the country, that he would of been in power in the U.S goverment later on in his life or would of pushed the first black presidency.