every rapper who uses concepts has atleast 1 verse or track about there death, mostly all of them do atleast one track saying goodbye to people, or saying sorry for the shit they did before, so no matter what when a big rapper (who does concepts) dies or gets murdered you can look back and into it too much and see concepts that may have a slight similiarity to there death, and again most rappers do tracks were its completely truthul and not being gangsta or having any image its just them saying there true feelings on the mic, and after they pass over (die) this track will get leaked and people are like "WOW he knew he was gonni die!!!!"
just look at 2pac, he didnt know he was gonni die, he had a true belief that he thought he would die through getting shot, and he wrote about it, he was also a very smart man and he made all these tracks and left smart little clues coz he knew after he died people would obsess over it and this would keep his family being able to make money from him so they could live happy after he was gone.