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A wall dedicated to the memory of US rapper Tupac Shakur is seen on May 26, 2016 in Los Angeles, California. Twenty years after his death, Tupac still reigns. Other rappers have succeeded him in stardom, and promotional efforts around Tupac have been haphazard, but the artist who died at age 25 on September 13, 1996, in Las Vegas, maintains a hold that is among the most enduring in recent times. / AFP / VALERIE MACON / TO GO WITH AFP STORY by Shaun TANDON, "20 years on, Tupac reigns as potent global force" (Photo credit should read VALERIE MACON/AFP via Getty Images)