A jury heard closing arguments on Monday in the trial of a former Los Angeles gang leader accused of involvement in the sensational murder three decades ago of chart-topping rapper Tupac Shakur. Duane “Keffe D” Davis, 63, a one-time leader of the South Side Compton Crips, is accused of ordering the September 7, 1996 killing after his nephew had been beaten by members of Shakur’s entourage in Las Vegas. “Duane Davis, in the culture of gangs, could not let that stand,” prosecutor Binu Palal said....