It's been 27 years since rapper Tupac Shakur was shot near the Las Vegas Strip, dying in hospital less than a week later. No charges were ever laid – that is, until Friday, when the police arrested long-time suspect Duane "Keefe D" Davis. Today, author and journalist Santi Elijah Holley explains how the Shakur legacy continues, and weighs in on the question we're all asking about the investigation: what took so long?