Former gang leader Duane "Keffe D" Davis charged with Tupac Shakur's 1996 murder in Las Vegas.
Davis, the alleged mastermind, arrested near his Las Vegas home.
Greg Kading, a retired detective, calls Davis "the last man standing" in the case.
Prosecutor describes Davis as the on-site commander who ordered Shakur's death.
The breakthrough came when security footage showed a fight between Shakur and Orlando Anderson.
The case remained unsolved for years until new information emerged in 2018.
Davis reportedly admitted being in the vehicle from which the shots were fired.
Sheriff vows justice after 27 years, emphasizing the importance of solving Shakur's murder.
Tupac Shakur, a hip-hop legend, released hit albums and acted in successful films.
In June, Shakur received a posthumous star on the Hollywood Walk of Fame.