Brian Betts. Photo by Bel Perez Gabilondo, courtesy DCPS The Post is now reporting that Montgomery County police chief J.T. Manger, while still waiting for the results of an autopsy, believes that the death of Shaw Middle School at Garnet-Patterson principal Brian Betts was a homicide. He went on to say that the preliminary investigation leads him to believe it was most likely not a random killing. Ward 2 D.C. Council member Jack Evans…