rewarded! going new places. rewarded! learn more at theexplorercard.com rap star tupac shakur died last night after a brief life in a rough business. he was 25. >> shakur has been at the center of a battle between east and west coast rappers. >> for the second time in six months, a star in the often brutal world of gangsta rap has been gunned down. >> music industry sources on the west coast suspect that smalls'