LAS VEGAS — Duane “Keffe D” Davis was sentenced Tuesday to 40 years to life in prison for the 1996 killing of rapper Tupac Shakur, closing a major chapter in a case that remained unsolved for decades. A Clark County judge imposed 20 years to life for first-degree murder and a consecutive 20 years to life for a deadly-weapon enhancement. Davis received credit for 731 days already served. Shakur was shot near the Las Vegas Strip on Sept. 7, 1996, and died six days later. A jury found Davis guilty in August. He is the only person charged in connection with the killing. Prosecutors said Davis had repeatedly described his role in the shooting, including in interviews and a 2019 memoir. Davis said he was in the passenger seat of a white Cadillac that pulled alongside the BMW carrying Shakur and Marion “Suge” Knight. He said his nephew, Orlando Anderson, fired the shots. Anderson and the two other people prosecutors said were in the Cadillac have since died. The killing followed a confrontation earlier that day in which Shakur and members of his entourage beat Anderson, according to Davis’s account. Prosecutors argued Davis took part in the retaliatory attack, though he did not pull the trigger. The defense challenged the case, citing alleged police corruption, concerns about a lawyer who had represented Davis years earlier and what it described as a lack of physical evidence placing him at the scene. Prosecutors relied in part on Davis’s statements to law enforcement and documentary filmmakers. He had spoken with detectives years earlier under an agreement with law enforcement that helped him avoid prosecution at the time. At Tuesday’s sentencing, Shakur’s sister, Sekyiwa “Set” Shakur, spoke through tears about the grief and mental health struggles she experienced after her brother’s death. “He had so much promise and intentions for a better world for our people,” she told the court. “He had plans.” Clark County District Attorney Steve Wolfson has said his office does not believe it has enough evidence to charge anyone else in the murder.