RALEIGH — The University of North Carolina at Chapel Hill graduate student charged with fatally shooting his faculty adviser has been found unfit for trial after two mental evaluations, a judge ruled Monday. Tailei Qi, 34, is accused of killing associate professor Zijie Yan in a science building at the state's flagship public university on Aug. 28. He is being held without bond on charges of first-degree murder and misdemeanor possession of a firearm on educational property. Orange County Superior Court Judge Alyson Grine said Monday that two separate mental evaluations found Qi likely suffers from untreated schizophrenia. "Qi demonstrated…