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In middle school, he was diagnosed with a severe anxiety disorder known as selective mutism, as well as major depressive disorder.[8] After this diagnosis he began to receive treatment and he continued receiving therapy and special education support until his junior year of high school. During Cho's last two years at Virginia Tech, several instances of his abnormal behavior, as well as plays and other writings he submitted containing references to violence, caused concern among teachers and classmates.

In the aftermath of the Virginia Tech massacre, Virginia Governor Tim Kaine convened a panel consisting of various officials and experts to investigate and examine the response and handling of issues related to the shootings. The panel released its final report in August 2007, devoting more than 30 pages to detailing Cho's troubled history. In the report, the panel criticized the failure of the educators and mental health professionals who came into contact with Cho during his college years to notice his deteriorating condition and help him. The panel also criticized misinterpretations of privacy laws and gaps in Virginia's mental health system and gun laws. In addition, the panel faulted Virginia Tech administrators in particular for failing to take immediate action after the first shootings. Nevertheless, the report did acknowledge that Cho was still primarily responsible for not seeking assistance and for his murderous rampage.[9]

From wiki

http://en.wikipedia.org/wiki/Seung-Hui_Cho