39-year-old Ernest Roberts had a quick appearance before a Miami-Dade judge Saturday on a murder charge. “Sir, you have been arrested for one count of premeditated murder. There’s an arrest warrant. You’re being held no bond,” a judge said. The former Miami Norland Senior High assistant principal is accused of killing teacher test administrator Kameela Russell. The state attorney in Miami-Dade announced an arrest had been made Friday. However, a motive is still unclear. “We all want to know that. it’s human nature to try to find out how was it that someone so close could’ve done this to someone...