BLACKSBURG, Va. – The gunman involved in the deadliest shooting in modern U.S. history had previously been accused of stalking two female student and had been taken to a mental health facility in 2005, but no charges were filed, police said Wednesday. Cho Seung-Hui worried one woman enough with his calls and e-mail in 2005 that police were called in, said Police Chief Wendell Flinchum. He said the woman declined to press charges and Cho was referred to the university disciplinary system. The case was then outside the scope of the police department, he said.In a separate incident, the department received a call from Cho’s parents who were concerned that he might be suicidal and he was taken to mental health facility, Flinchum said.Cho’s roommates and professors described on Wednesday a troubled, quiet young man who rarely spoke to his roommates or made eye contact with them. Roommates Joseph Aust and Karan Grewal said his bizarre behavior became even less predictable in recent weeks. Cho started waking up as early as 5:30 a.m. instead of his usual 7 a.m., Aust, told ABC’s “Good Morning America.” “I tried to make conversation with him earlier in the year when he moved in,” Aust said. “He would just give one-word answers and stay quiet. He pretty much never looked me in the eye.”