Lucious Brown, former principal of Kennedy Middle School, speaks during his plea hearing on Friday, January 17, 2014. Lucious Brown on Friday became the third principal to plead guilty in the Atlanta Public Schools test-cheating scandal. Brown, who once headed Kennedy Middle School, pleaded guilty to a single felony count before Fulton County Superior Court Judge Jerry Baxter. HYOSUB SHIN / HSHIN@AJC.COM