- 1949, Camden, N.J. 13 killed. Howard Unruh, a World War II veteran, walks the streets of Camden killing random people.
- 1966, Austin. 18 killed. Charles Whitman fires from a tower on the University of Texas campus.
- 1982, Wilkes-Barre, Pa. 13 killed. George Banks kills five of his children and 8 other people.
- 1984, San Ysidro, Calif. 21 killed. James Huberty enters a McDonald’s and begins shooting.
- 1986, Edmond, Okla. 14 killed. Postal worker Patrick Sherrill kills 14 people at his workplace.
- 1990, Jacksonville, Fla. 10 killed. James Pough kills 8 people after his car is repossessed. He'd killed two others earlier.
- 1991, Killeen, Tex. 23 killed. George Hennard drives his truck into a cafeteria and then opens fire.
- 1999, Littleton, Colo. 13 killed. The shooting at Columbine High School is the deadliest high school shooting to date.
- 1999, Atlanta. 12 killed. Mark Barton kills nine people at brokerage firms after having killed three relatives.
- 2005, Red Lake, Minn. 9 killed. Jeffrey Weise kills members of his family and then students at a local high school.
- 2007, Blacksburg, Va. 32 killed. Until Sunday, the 32 people killed by Seung Hui Cho at Virginia Tech was the deadliest mass shooting in U.S. history.
- 2009, Fort Hood, Tex. 13 killed. Nidal Hasan kills 13 people at the Army base.
- 2009, Binghamton, N.Y. 13 killed. Jiverly Wong murders 13 people at a small immigrant services center.
- 2009, Geneva County, Ala. 10 killed. Michael McClendon kills 10 people, including a baby, in rural Alabama.
- 2012, Newtown, Conn. 27 killed. Adam Lanza’s spree at Sandy Hook Elementary included the murder of 20 children.
- 2012, Aurora, Colo. 12 killed. James Holmes opens fire during a late-night movie screening.
- 2013, Washington. 12 killed. Aaron Alexis kills a dozen people with a shotgun.
- 2015, San Bernardino, Calif. 14 killed. Syed Farook and his wife, Tashfeen Malik, kill more than a dozen people during a holiday party.
- 2015, Roseburg, Ore. 9 killed. Chris Mercer kills nine in a shooting at a community college in Oregon.
- 2015, Charleston, S.C. 9 killed. Dylann Roof attends a prayer meeting at a historic black church in Charleston before opening fire.
- 2016, Orlando. 50 killed. The attack at the gay nightclub Pulse in Orlando is the deadliest in U.S. history.
June 12, 2016 at 11:47 AM EDT