Duane “Keffe D” Davis is the last living suspect in one of hip-hop’s most enduring mysteries — the 1996 death of rapper Tupac Shakur in Las Vegas

LAS VEGAS — New details about one of hip-hop’s most enduring mysteries the 1996 killing of rap icon Tupac Shakur could finally come to light in the upcoming trial of Duane “Keffe D” Davis.
Davis, 63…