Feb. 21: Norcross, Ga.
4 killed, plus shooter
Jeong Soo Paek, 59, a man with a history of violence and who had been asked to leave the familys spa, returned later in the evening and killed his sisters and their husbands before shooting himself.
Feb. 27: Chardon, Ohio
3 killed, 2 injured
T.J. Lane, 17, a sophomore at another area school, reportedly walked into the Chardon High School cafeteria and fired 10 shots at four students sitting at a table. Lane has pleaded not guilty by reason of insanity; his trial is scheduled for January.
March 8: Pittsburgh
1 killed, plus shooter, 7 injured
A former Duquesne University teaching assistant who had been barred from campus, John Shick, 30, began shooting as he marched through a psychiatric hospital. He was shot dead by police.
April 2: Oakland
7 killed, 3 injured
Former nursing student One L. Goh, 43, who had dropped out of Oikos University, returned to the school, reportedly pulled an administrator into a nursing classroom, lined up students against the wall and began shooting them. He has pleaded not guilty and awaits trial.
April 6: Tulsa
3 killed, 2 injured
Jake England, 19, and Alvin Watts, 33, are accused of targeting random black men in four locations as they drove around town in an Easter weekend shooting spree. They are awaiting formal arraignment.
May 30: Seattle
5 killed, plus shooter, 1 injured
Ian Lee Stawicki, 40, who had a history of mental and behavioral problems, was asked by a barista to leave a coffee shop before he stood up and opened fire. He fled and killed himself as police closed in hours later.
July 20: Aurora, Colo.
12 killed, 58 injured
Grad student James Eagan Holmes, 24, reportedly entered a mall theater during a midnight showing of The Dark Knight Rises, set off gas canisters and opened fire. He awaits trial and has not entered a plea.
Aug. 5: Oak Creek, Wisc.
6 killed, plus shooter, 3 injured
White supremacist Wade Michael Page, 40, walked into a Sikh temple and opened fire just before Sunday services. Police wounded Page, who then fatally shot himself.
Aug. 13: College Station, Texas
2 killed, plus shooter, 4 injured
Thomas Caffall III, 35, opened fire on police who approached his house to serve an eviction notice about two blocks from the Texas A&M campus. Police shot the gunman and he died in custody.
Sept. 27: Minneapolis
6 killed, plus shooter, 3 injured
As Andrew Engeldinger, 36, was being fired from his job at a sign-making company, he pulled out a gun and shot his two managers, the owner, other employees and a UPS driver as he walked around the building before shooting himself.
Oct. 21: Brookfield, Wisc.
3 killed, plus shooter, 4 injured
Radcliffe Franklin Haughton, 45, a former Marine whose wife had obtained a restraining order against him three days earlier, entered the suburban Milwaukee spa where she worked and shot her and six other women before killing himself.
Dec. 11: Happy Valley, Ore.
2 killed, plus shooter, 1 injured
Former gyro shop employee Jacob Tyler Roberts, 22, wearing a white hockey mask, opened fire randomly inside a shopping mall. Officials said his gun, reportedly stolen from an acquaintance, jammed during the spree but he killed himself with a final shot.
Dec. 14: Newtown, Conn.
27 killed, plus shooter, unknown number injured
According to police, Adam Lanza, 20, entered Sandy Hook Elementary School and shot and killed 26 people, including 20 children, and then himself. His mother was a kindergarten teacher at the school and many of her students were among those killed. Police said that Lanza killed his mother at a secondary crime scene.