Tupac Shakur  Tupac Shakur's "All Eyez on Me" release was a
double CD that sold more than five 5 million copies,
transforming Shakur into a pop superstar. (Ken Nahoum / Edge
Film)   Despite the public setting and the victim's notoriety,
no one has ever been arrested for the killing. Shakur's family,
many of his followers and some black entertainers cite the case
as evidence of a double standard in the justice system. Had a
white celebrity been gunned down in the open, they contend,
police would have found those responsible without delay.  Las
Vegas police say their investigation stalled not for lack of
effort, but because witnesses in Shakur's entourage refused to
cooperate.    • They failed to follow up with a member of
Shakur's entourage who witnessed the shooting and told police he
might be able to identify one or more of the assailants. The
witness was killed several weeks later in an unrelated shooting.
Las Vegas homicide Sgt. Kevin Manning, who oversaw the
investigation, defended his department's work