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Duane 'Keffe D' Davis was sentenced to 40 years in prison for orchestrating the 1996 murder of rap superstar Tupac Shakur, closing out a trial held over three weeks in August in which his own memoir was used as key evidence. The sentencing marks the resolution of one of hip-hop's most notorious unsolved killings, nearly 30 years after Shakur was gunned down in Las Vegas.