A former gang leader goes on trial Monday in Las Vegas over the decades-old murder of rapper Tupac Shakur, one of America's most high-profile unresolved murders. Prosecutors say Death Row Records was protected by Mob Piru, a Los Angeles gang that was part of the wider Bloods alliance. Later that night, a white Cadillac carrying Davis, Anderson and others pulled up beside Shakur's car in Las Vegas. In that book, Davis recounted that he was in the front seat of the Cadillac and that he handed a pistol to those in the back seat. Davis now says he was in Los Angeles the night of the Shakur killing and that he has never even read his own memoirs.