A key witness who previously took a plea deal to second-degree murder testified in a trial involving his former co-defendants on May 26 before DC Superior Court Judge Danya Dayson. Alonzo Brown, 29, and Naquel Henderson, 28, are charged with one count of first-degree premeditated murder while armed, one count of conspiracy to commit a crime of violence while armed, four counts of assault with intent to kill while armed, and five counts of posse…