USA, Las Vegas — The first arrest in the 1996 death of Tupac Shakur came Friday with the murder indictment of Duane “Keffe D” Davis, one of the last living witnesses to the Las Vegas drive-by shooting of the hip-hop superstar. Here’s a look at the hours that led up to the fatal gunfire. On the afternoon of September 7, 1996, Shakur and Suge Knight, the head of his music label, Death Row Records…