LAS VEGAS — The case of rap icon Tupac Shakur 's killing has been unresolved for decades; now the man charged in his 1996 killing in Las Vegas is going to trial. Duane “Keffe D” Davis, 63, faces one charge of murder with a deadly weapon with the intent to promote, further or assist a criminal gang in Shakur's death. Jury selection begins Monday, with the trial scheduled to last about a month. The trial will bring to a head one of the biggest mysteries in the hip-hop world that gripped the public for decades. Shakur, who also went by the stage names 2Pac and Makaveli, is considered one of the most influential rappers of all time. Shakur was shot in Las Vegas on Sept. 7, 1996. He was in a black BMW with music mogul Marion “Suge” Knight on their way to Club 662, where Shakur was scheduled to perform, when a white Cadillac pulled up beside them. Gunfire erupted. Shakur, who was in the passenger seat, was shot multiple times and died six days later, while Knight survived. The case went cold until recent years, when public statements and a tell-all memoir from Davis revived the case.