Feb. 14, 2008: Northern Illinois University shooting: Former sociology student 27-year-old Steven Kazmierczak used a shotgun and three pistols to kill five and injure 21 more before committing suicide. At the time, Kazmierczak was enrolled in a graduate social work program at the University of Illinois at Urbana-Champaign.
April 2, 2012: Oikos University shooting: Former student One L. Goh is suspected of shooting and killing seven, and injured three others at Oikos University, a Korean Christian college in Oakland, Calif. He fled campus and surrendered to authorities as a Safeway grocery store. He was determined mentally incompetent to stand trial and was committed for treatment.
June 7, 2013: Santa Monica shooting: Former student John Samir Zawahri killed his father and brother, then carjacked a stranger, forcing her to drive him to Santa Monica College. Armed with an AR-15-type semi-automatic rifle, he began shooting at vehicles on campus. Then he walked into the library and opened fire. Altogether his rampage claimed the lives of 5 and injured 4 others. Police officers shot him in the library, and he later died from his wounds.
Oct. 1, 2015: Umpqua Community College: A 26-year-old student, Christopher Harper-Mercer, was enrolled in a writing class. He walked into the classroom and shot and killed 9 and injured 9 others. He asked at least two students what their religion was before he shot them. He committed suicide following a gunfight with police officers.