XXXTentacion was a rising star in the music world, whose latest album debuted at the top of Billboard's 200 Albums Chart in March. He was gunned down this week in Florida. Just 20 years old, he's the latest hip-hop star to die young. Tupac Shakur was 25 when he was fatally shot in a car in Las Vegas after leaving a boxing match. The California rapper was said to be caught up in a battle between East Coast and West Coast rappers. He remains one of the best-selling music artists of all time.