Immediately after Mr. Shakur’s death, there was a flurry of activity in the investigation. More than 20 people were arrested in connection with shootings that the police said were suspected to be related gang attacks.
But as the years went on without any charges, Shakur’s killing — and the death of the Notorious B.I.G., his friend turned rival, six months later — fueled conspiracy theories and accusations that the police had not worked hard enough to bring his killers to justice. The Las Vegas police have cited a lack of cooperation from people close to Mr. Shakur as a reason for the stalled investigation.
The killings became the subjects of books, podcasts, TV series and films, further elevating Mr. Shakur — known for albums such as “Me Against the World,” on which he rapped about a life imperiled by violence, and “All Eyez on Me,” one of the genre’s first double albums — to a mythic role in hip-hop.
The investigation into the death of the Notorious B.I.G. was revived by the Los Angeles Police Department in the mid-2000s, ultimately leading to a re-examination of the Shakur killing. Greg Kading, one of the detectives involved in the inquiry, later wrote a book that detailed how investigators convinced Mr. Davis to cooperate with them through a proffer agreement, meaning he could not be charged with a crime based on any incriminating statements he might make in those interviews.
“I sang because they promised I would not be prosecuted,” Mr. Davis wrote in his memoir.
On the night of the shooting, Mr. Shakur had been traveling in a BMW driven by Mr. Knight toward a postfight after-party at Club 662, a new venue backed by their record label, Death Row Records.
Mr. Davis, a self-described member of the Crips, wrote in his memoir that he, Mr. Anderson and others had armed themselves and waited in the nightclub parking lot, hoping to confront Mr. Shakur and Mr. Knight, who were associated with the Bloods, about the earlier violence.