Previous Workplace Shootings in the U.S.

Major workplace shootings before Tuesday’s killing of seven people at Edgewater Technology in Wakefield, Mass.:

* March 20: Fired employee Robert Harris, 28, fatally shoots five people at a Dallas-area carwash. He is sentenced to death.

* Dec. 30, 1999: Housekeeper Silvio Izquierdo-Leyva, 36, allegedly fatally shoots five co-workers at Tampa, Fla.’s Radisson Bay Harbor hotel. He pleads not guilty.

* Nov. 2, 1999: Copier repairman Byran Uyesugi, 40, fatally shoots seven people at the Xerox Corp. in Honolulu. He is sentenced to life in prison.

* Aug. 5, 1999: Truck driver Alan E. Miller, 35, fatally shoots two co-workers at a Pelham, Ala., office, then kills a former co-worker. He is sentenced to death.

* July 29, 1999: Former day trader Mark Barton, 44, kills nine people at two Atlanta brokerage offices and commits suicide.

* March 6, 1998: Former Connecticut Lottery Corp. accountant Matthew Beck, 35, fatally shoots four lottery executives, then himself.

* Dec. 18, 1997: Fired employee Arturo R. Torres, 43, kills four former co-workers at a maintenance yard in Orange, Calif., and is shot to death by police.

* Sept. 15, 1997: Fired assembly line worker Arthur H. Wise, 43, allegedly opens fire at Aiken, S.C., parts plant, killing four. Trial pending.

* April 24, 1996: Firefighter Kenneth Tornes kills four superiors at a Jackson, Miss., firehouse. Tornes dies on death row.

* April 3, 1995: Former employee James Simpson, 28, fatally shoots five people at a refinery inspection station in Corpus Christi, Texas, then kills himself.

* July 19, 1995: City electrician Willie Woods fatally shoots four supervisors at C. Erwin Piper Technical Center in Los Angeles. He is sentenced to life in prison.