A graduate student allegedly shot and killed a faculty member at UNC-Chapel Hill 

Monday afternoon, according to university officials and police, locking down the campus for several hours.

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The suspect, Tailei Qi, a graduate student in applied physical sciences, was taken into custody Monday afternoon.

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University officials and police did not identify the deceased faculty member as they worked to notify their family.

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Police have not pinpointed a motive, but Qi’s Twitter posts expressed frustration, stress and depression.

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This year and last, he made a series of vague posts about conflict with other students and his “PI” or principal investigator, usually a

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faculty member assigned by the university to work with students on research projects.

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It is not clear whether that PI is the faculty member who was killed.

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