Some recent fatal shootings at U.S. workplaces:

--Feb. 25, 2003: Emanuel Burl Patterson, 23, allegedly opened fire at Labor Ready Inc., a temporary employment service in Huntsville, Ala., killing four fellow job-seekers and wounding a fifth.

--Feb. 5, 2001: William D. Baker, 66, killed four people, then himself at a Navistar International engine plant in suburban Chicago.

--Dec. 26, 2000: Software tester Michael McDermott accused of killing seven people at a Wakefield, Mass., Internet consulting company, Edgewater Technology Inc. He was convicted and sentenced to life without parole.

--March 20, 2000: Fired employee Robert Harris, 28, accused of shooting five people to death at a Dallas-area car wash. He was convicted and sentenced to death.

--Dec. 30, 1999: Housekeeper Silvio Izquierdo-Leyva, 36, accused of fatally shooting five co-workers at Tampa's Radisson Bay Harbor (search) hotel.

--Nov. 2, 1999: Copier repairman Byran Uyesugi, 40, accused of shooting seven people to death at Xerox Corp. (search) in Honolulu. He was convicted and sentenced to life in prison.

--Aug. 5, 1999: Truck driver Alan E. Miller, 35, accused of shooting two co-workers to death at Pelham, Ala., office, then killing former co-worker. He was convicted and sentenced to death.

--July 29, 1999: Former day trader Mark Barton, 44, killed nine people at two Atlanta brokerage offices and later committed suicide.

--March 6, 1998: Former Connecticut Lottery Corp. (search) accountant Matthew Beck, 35, shot four lottery executives to death, then himself.

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

--Sept. 15, 1997: Fired assembly line worker Arthur H. Wise, 43, opens fire at Aiken, S.C., parts plant, killing four. He is convicted and sentenced to death.

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