This was in the 90s. Chalino Sanchez was a famous Mexican singer that started a genre of Mexican music called Narcocorridos. Basically he was singing and harmonizing about cartel gang shiit.
Well apparently he was told not to perform music in a certain cartel city, but he did anyway. Before he started his concert he was given a note that said after his show he was going to die. The next morning he was found on the side of a road with two gun shots to the back of his head.
Here is actual video of him reading the note.
Jesus Christ you can see the shookness in his face
If the Cartel says not to do something, then you don't fukkin do it.