Jay-Z, Meek Mill and others over at Roc Nation are speaking out publicly to demand justice for the slaying of Ahmaud Arbery -- asking for a speedy trial and conviction of his killers. Jigga, Meek and other Roc Nation artists -- including Alicia Keys and Yo Gotti -- have signed an open letter they're releasing this weekend, which is made out to Georgia Governor Brian Kemp, Georgia AG Christopher Darr and District Attorney Tom Durden.